GPT-4o (2024-08-06) vs GPT-5.6 Sol
GPT-5.6 Sol leads GPT-4o (2024-08-06) on the Artificial Analysis Intelligence Index, 47.0 to 7.7, and GPT-4o (2024-08-06) costs 2.0x less per output token ($10.00 vs $20.00 per million). Updated October 22, 2026; 49 benchmarks have a result for both.
vs boards won of 49 shared
GPT-4o (2024-08-06) or GPT-5.6 Sol: which to pick
Only GPT-5.6 Sol has a coding score, 73.5 on the Vibe Coding Index; GPT-4o (2024-08-06) has none, so the two cannot be ranked on coding.
Pick GPT-4o (2024-08-06) for output tokens 2.0x cheaper ($10.00 vs $20.00 per million).
Model AGPT-4o (2024-08-06)OpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-5.6 SolOpenAI73.5/1006 independent benchmarks$1.20 per solved task
- Shared results
- 49
- GPT-4o (2024-08-06) only
- 9
- GPT-5.6 Sol only
- 99
- Like-for-like categories
- 7 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Only GPT-5.6 Sol has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
GPT-5.6 Sol
GPT-5.6 Sol leads, 47.0 against 7.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only GPT-5.6 Sol has a AA Agentic Index result, 50.2.
Directional only
Reasoning
GPQA Diamond
No call
Only GPT-5.6 Sol has a GPQA Diamond result, 95.2%.
Directional only
Math
AIME
No call
Only GPT-4o (2024-08-06) has a AIME result, 14.0%.
Directional only
Knowledge
MMLU Pro
GPT-5.6 Sol
GPT-5.6 Sol leads, 89.1% against 74.1%.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-5.6 Sol has a Design Arena: websites result, 1321.
Directional only
Long documents
Listed context window
GPT-5.6 Sol
GPT-5.6 Sol takes 1.05M tokens against 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-4o (2024-08-06)
GPT-4o (2024-08-06) $0.0075, GPT-5.6 Sol $0.014 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.6 Sol has the number, $1.20.
Directional only
At a glance
- Coding index
- GPT-4o (2024-08-06) not benchmarked, GPT-5.6 Sol 73.5 from 6 benchmarks.
- Widest category
- Math, 62.3 points apart on average over 4 shared benchmarks.
- Widest single gap
- OTIS Mock AIME: GPT-4o (2024-08-06) 6.4% against GPT-5.6 Sol 100.0%, 93.6 points apart on a 0 to 100 scale.
- Output price
- GPT-4o (2024-08-06) $10.00 against GPT-5.6 Sol $20.00 per million output tokens, 2.0x apart.
- Context window
- GPT-4o (2024-08-06) takes 128K tokens, GPT-5.6 Sol 1.05M.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | GPT-4o (2024-08-06) | Bars | GPT-5.6 Sol | Ties |
|---|---|---|---|---|
| Coding | 0 | 3 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 1 | ||
| Reasoning | 0 | 9 | ||
| Math | 0 | 4 | ||
| Knowledge | 0 | 10 | ||
| General | 0 | 21 | ||
| All shared boards | 0 | 49 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index03
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| Aider polyglot | 23.1% | Not measured | Only GPT-4o (2024-08-06) measured |
| SWE-bench Lite | 21.7% | Not measured | Only GPT-4o (2024-08-06) measured |
| LiveBench coding | Not measured | 89.7% | Only GPT-5.6 Sol measured |
| LMArena WebDev | Not measured | 1616 | Only GPT-5.6 Sol measured |
| AA Coding Index | Not measured | 77.4 | Only GPT-5.6 Sol measured |
| LiveCodeBench (Vals AI) | Not measured | 82.6% | Only GPT-5.6 Sol measured |
| SWE-bench Verified (Vals AI) | Not measured | 96.2% | Only GPT-5.6 Sol measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 37.9% | Only GPT-5.6 Sol measured |
| Vibe Code Bench (Vals AI) | Not measured | 80.5% | Only GPT-5.6 Sol measured |
| Code migration (Vals AI) | Not measured | 52.9% | Only GPT-5.6 Sol measured |
| ProgramBench (Vals AI) | Not measured | 1.5% | Only GPT-5.6 Sol measured |
| IOI (Vals AI) | Not measured | 91.2% | Only GPT-5.6 Sol measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 85.8% | Only GPT-5.6 Sol measured |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 20.0% | Only GPT-5.6 Sol measured |
| SkillsBench (Vals AI) | Not measured | 54.1% | Only GPT-5.6 Sol measured |
| CyberBench (Vals AI) | Not measured | 76.3% | Only GPT-5.6 Sol measured |
| LiveCodeBench (Artificial Analysis run) | 31.7% | Not measured | Only GPT-4o (2024-08-06) measured |
| SciCode | Not measured | 57.8% | Only GPT-5.6 Sol measured |
| Terminal-Bench Hard (Artificial Analysis run) | 8.3% | 65.9% | GPT-5.6 Sol |
| FrontierCode | Not measured | 47.5% | Only GPT-5.6 Sol measured |
| FrontierSWE | Not measured | 32.2% | Only GPT-5.6 Sol measured |
| GSO-Bench | Not measured | 76.5% | Only GPT-5.6 Sol measured |
| WeirdML | Not measured | 88.8% | Only GPT-5.6 Sol measured |
| MirrorCode | Not measured | 20.0% | Only GPT-5.6 Sol measured |
| ALE-Bench | Not measured | 2176.9 | Only GPT-5.6 Sol measured |
| LMArena Text: coding | 1283 | 1496 | GPT-5.6 Sol |
| LMArena Text: software and IT | 1278 | 1489 | GPT-5.6 Sol |
| LMArena WebDev: React | Not measured | 1620 | Only GPT-5.6 Sol measured |
| LMArena WebDev: HTML | Not measured | 1618 | Only GPT-5.6 Sol measured |
| LMArena WebDev: from an image | Not measured | 1609 | Only GPT-5.6 Sol measured |
| SciCode | Not measured | 10.8% | Only GPT-5.6 Sol measured |
| SWE-Bench Pro V2 | Not measured | 95.5% | Only GPT-5.6 Sol measured |
| SWE Atlas: Codebase QnA | Not measured | 46.0% | Only GPT-5.6 Sol measured |
| SWE Atlas: Test Writing | Not measured | 45.9% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 9 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| AA Intelligence Index | 7.7 | 47.0 | GPT-5.6 Sol |
| Epoch Capabilities Index | Not measured | 162.8 | Only GPT-5.6 Sol measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 50.2 | Only GPT-5.6 Sol measured |
| Design Arena: agents building web apps | Not measured | 1245 | Only GPT-5.6 Sol measured |
| Design Arena: agents building full-stack apps | Not measured | 1261 | Only GPT-5.6 Sol measured |
| Design Arena: agents building mobile apps | Not measured | 1248 | Only GPT-5.6 Sol measured |
| Design Arena: agents building Android apps | Not measured | 1239 | Only GPT-5.6 Sol measured |
| Design Arena: agents building Godot games | Not measured | 1260 | Only GPT-5.6 Sol measured |
| Design Arena: agents building games | Not measured | 1266 | Only GPT-5.6 Sol measured |
| Design Arena: HTML slides | Not measured | 1225 | Only GPT-5.6 Sol measured |
| Design Arena: PowerPoint slides | Not measured | 1214 | Only GPT-5.6 Sol measured |
| LiveBench research | Not measured | 54.5% | Only GPT-5.6 Sol measured |
| LiveBench browser | Not measured | 88.0% | Only GPT-5.6 Sol measured |
| LiveBench long agentic | Not measured | 48.5% | Only GPT-5.6 Sol measured |
| SREBench (Vals AI) | Not measured | 30.5% | Only GPT-5.6 Sol measured |
| Finance Agent (Vals AI) | Not measured | 53.8% | Only GPT-5.6 Sol measured |
| Tax Agent Bench (Vals AI) | Not measured | 31.1% | Only GPT-5.6 Sol measured |
| Legal Research Bench (Vals AI) | Not measured | 48.1% | Only GPT-5.6 Sol measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 72.3% | Only GPT-5.6 Sol measured |
| BioMysteryBench (Vals AI) | Not measured | 71.1% | Only GPT-5.6 Sol measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 20.0% | Only GPT-5.6 Sol measured |
| Vals Science Index | Not measured | 41.5% | Only GPT-5.6 Sol measured |
| Time Horizon Index (Vals AI) | Not measured | 23.8% | Only GPT-5.6 Sol measured |
| CUA-bench (Vals AI) | Not measured | 8.3% | Only GPT-5.6 Sol measured |
| τ²-Bench Telecom | 28.9% | 85.1% | GPT-5.6 Sol |
| OSWorld 2.0 | Not measured | 27.3% | Only GPT-5.6 Sol measured |
| BALROG | Not measured | 60.0% | Only GPT-5.6 Sol measured |
| PostTrainBench | Not measured | 36.2% | Only GPT-5.6 Sol measured |
| Vending-Bench 2 | Not measured | $9,619 | Only GPT-5.6 Sol measured |
| LMArena Search | Not measured | 1261 | Only GPT-5.6 Sol measured |
| MCP Atlas | Not measured | 81.8% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 13 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 95.2% | Only GPT-5.6 Sol measured |
| LiveBench reasoning | Not measured | 91.7% | Only GPT-5.6 Sol measured |
| MysteryMechanism (Vals AI) | Not measured | 33.3% | Only GPT-5.6 Sol measured |
| MMMU Pro (Vals AI) | 64.0% | 88.8% | GPT-5.6 Sol |
| GPQA Diamond (Artificial Analysis run) | 52.1% | 94.1% | GPT-5.6 Sol |
| Humanity's Last Exam (Artificial Analysis run) | 2.3% | 49.5% | GPT-5.6 Sol |
| GPQA Diamond (Epoch AI run) | 49.2% | 93.5% | GPT-5.6 Sol |
| ARC-AGI | Not measured | 97.5% | Only GPT-5.6 Sol measured |
| ARC-AGI-2 | Not measured | 92.5% | Only GPT-5.6 Sol measured |
| SimpleBench | 17.8% | 64.8% | GPT-5.6 Sol |
| Chess puzzles | 6.0% | 59.0% | GPT-5.6 Sol |
| Mystery game puzzles | Not measured | 58.0% | Only GPT-5.6 Sol measured |
| EBR-bench | Not measured | 44.8% | Only GPT-5.6 Sol measured |
| LMArena Text: hard prompts | 1264 | 1483 | GPT-5.6 Sol |
| LMArena Text: expert | 1241 | 1517 | GPT-5.6 Sol |
| LMArena Text: hard prompts in English | 1277 | 1477 | GPT-5.6 Sol |
| LMArena Vision: diagrams | Not measured | 1305 | Only GPT-5.6 Sol measured |
| LMArena Vision: homework | Not measured | 1305 | Only GPT-5.6 Sol measured |
| Kagi LLM Benchmark | Not measured | 67.0% | Only GPT-5.6 Sol measured |
| Humanity's Last Exam (Scale run) | Not measured | 31.2% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| AIME | 14.0% | Not measured | Only GPT-4o (2024-08-06) measured |
| MATH 500 (Vals AI) | 75.2% | Not measured | Only GPT-4o (2024-08-06) measured |
| MGSM (Vals AI) | 90.7% | Not measured | Only GPT-4o (2024-08-06) measured |
| OTIS Mock AIME | 6.4% | 100.0% | GPT-5.6 Sol |
| FrontierMath, tiers 1 to 3 | 0.4% | 89.1% | GPT-5.6 Sol |
| FrontierMath, tier 4 | Not measured | 82.9% | Only GPT-5.6 Sol measured |
| ProofBench | Not measured | 83.0% | Only GPT-5.6 Sol measured |
| MATH level 5 | 53.3% | Not measured | Only GPT-4o (2024-08-06) measured |
| LMArena Text: math | 1285 | 1473 | GPT-5.6 Sol |
| LMArena Text: mathematical work | 1283 | 1496 | GPT-5.6 Sol |
| MathArena | Not measured | 62.9% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index010
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| MMLU Pro | 74.1% | 89.1% | GPT-5.6 Sol |
| LegalBench (Vals AI) | 80.1% | 87.0% | GPT-5.6 Sol |
| CorpFin (Vals AI) | 39.4% | 64.4% | GPT-5.6 Sol |
| TaxEval (Vals AI) | 71.1% | 74.8% | GPT-5.6 Sol |
| MortgageTax (Vals AI) | 61.0% | 67.3% | GPT-5.6 Sol |
| MedQA (Vals AI) | 88.2% | Not measured | Only GPT-4o (2024-08-06) measured |
| MedCode (Vals AI) | Not measured | 44.0% | Only GPT-5.6 Sol measured |
| SimpleQA Verified | 26.0% | 69.7% | GPT-5.6 Sol |
| MMLU | 84.3% | Not measured | Only GPT-4o (2024-08-06) measured |
| LMArena Text: science | 1274 | 1455 | GPT-5.6 Sol |
| LMArena Text: medicine and healthcare | 1252 | 1431 | GPT-5.6 Sol |
| LMArena Text: legal and government | 1275 | 1476 | GPT-5.6 Sol |
| LMArena Text: business and finance | 1232 | 1457 | GPT-5.6 Sol |
| FACTS Benchmark Suite | Not measured | 52.4% | Only GPT-5.6 Sol measured |
| PRBench Finance | Not measured | 50.4% | Only GPT-5.6 Sol measured |
| PRBench Legal | Not measured | 50.5% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 4 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1321 | Only GPT-5.6 Sol measured |
| Design Arena: UI components | Not measured | 1336 | Only GPT-5.6 Sol measured |
| Design Arena: game dev | Not measured | 1367 | Only GPT-5.6 Sol measured |
| Design Arena: data viz | Not measured | 1323 | Only GPT-5.6 Sol measured |
| Design Arena: 3D | Not measured | 1384 | Only GPT-5.6 Sol measured |
| Design Arena: all code categories | Not measured | 1341 | Only GPT-5.6 Sol measured |
| Design Arena: SVG | Not measured | 1315 | Only GPT-5.6 Sol measured |
| Design Arena: ASCII art | Not measured | 1304 | Only GPT-5.6 Sol measured |
| LiveBench design | Not measured | 81.6% | Only GPT-5.6 Sol measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index021
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| LiveBench data analysis | Not measured | 79.8% | Only GPT-5.6 Sol measured |
| Public Benefits Bench (Vals AI) | Not measured | 66.5% | Only GPT-5.6 Sol measured |
| SAGE (Vals AI) | Not measured | 52.6% | Only GPT-5.6 Sol measured |
| MedScribe (Vals AI) | Not measured | 85.2% | Only GPT-5.6 Sol measured |
| Vals Multimodal Index | Not measured | 72.6% | Only GPT-5.6 Sol measured |
| IFBench | 36.0% | 72.7% | GPT-5.6 Sol |
| Long context reasoning (AA-LCR) | 41.0% | 84.0% | GPT-5.6 Sol |
| DTBench | Not measured | 95.7% | Only GPT-5.6 Sol measured |
| LMCA | Not measured | 58.5% | Only GPT-5.6 Sol measured |
| Surface Evolver Bench | Not measured | 93.1% | Only GPT-5.6 Sol measured |
| Furniture assembly | Not measured | 56.7% | Only GPT-5.6 Sol measured |
| LMArena Text | 1283 | 1457 | GPT-5.6 Sol |
| LMArena Text: instruction following | 1267 | 1483 | GPT-5.6 Sol |
| LMArena Text: creative writing | 1274 | 1449 | GPT-5.6 Sol |
| LMArena Vision | 1065 | 1281 | GPT-5.6 Sol |
| LMArena Text: English | 1297 | 1457 | GPT-5.6 Sol |
| LMArena Text: non-English | 1262 | 1451 | GPT-5.6 Sol |
| LMArena Text: Chinese | 1254 | 1525 | GPT-5.6 Sol |
| LMArena Text: German | 1257 | 1476 | GPT-5.6 Sol |
| LMArena Text: Japanese | 1234 | 1472 | GPT-5.6 Sol |
| LMArena Text: Korean | 1218 | 1442 | GPT-5.6 Sol |
| LMArena Text: French | 1263 | 1472 | GPT-5.6 Sol |
| LMArena Text: Spanish | 1269 | 1443 | GPT-5.6 Sol |
| LMArena Text: Russian | 1272 | 1471 | GPT-5.6 Sol |
| LMArena Text: Polish | Not measured | 1459 | Only GPT-5.6 Sol measured |
| LMArena Text: multi-turn | 1279 | 1461 | GPT-5.6 Sol |
| LMArena Text: longer queries | 1283 | 1481 | GPT-5.6 Sol |
| LMArena Text: writing and language | 1290 | 1462 | GPT-5.6 Sol |
| LMArena Text: entertainment and media | 1267 | 1450 | GPT-5.6 Sol |
| LMArena Vision: English | 1072 | 1280 | GPT-5.6 Sol |
| LMArena Vision: Chinese | 1009 | 1313 | GPT-5.6 Sol |
| LMArena Vision: reading text | Not measured | 1290 | Only GPT-5.6 Sol measured |
| LMArena Vision: humor | Not measured | 1246 | Only GPT-5.6 Sol measured |
| LMArena Vision: creative writing | Not measured | 1283 | Only GPT-5.6 Sol measured |
| LMArena Document | Not measured | 1483 | Only GPT-5.6 Sol measured |
| EQ-Bench 4 | Not measured | 1250 | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 12 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-4o (2024-08-06) | GPT-5.6 Sol | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
GPT-4o (2024-08-06)$0.0075Fits in one request
GPT-5.6 Sol$0.014Fits in one request
GPT-4o (2024-08-06) costs less
Repository review
50K input + 3K output tokens
GPT-4o (2024-08-06)$0.155Fits in one request
GPT-5.6 Sol$0.260Fits in one request
GPT-4o (2024-08-06) costs less
Agent loop
200K input + 10K output tokens
GPT-4o (2024-08-06)$0.600Exceeds the context window
GPT-5.6 Sol$1.00Fits in one request
GPT-4o (2024-08-06) costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | OpenAI GPT-4o (2024-08-06) | OpenAI GPT-5.6 Sol |
|---|---|---|
| Maker | OpenAI | OpenAI |
| Weights | No public weights listed | No public weights listed |
| Released | August 6, 2024 | July 9, 2026 |
| Context window | 128K | 1.05M |
| Input $/Mtok | $2.50 | $4.00 |
| Output $/Mtok | $10.00 | $20.00 |
| Coding index | Not benchmarked | 73.5 |
| Independent measurements behind it | 0 | 6 |
| Cost per solved task | Not computable | $1.20 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-4o (2024-08-06) better than GPT-5.6 Sol for coding?
Only GPT-5.6 Sol has a coding score, 73.5 on the Vibe Coding Index; GPT-4o (2024-08-06) has none, so the two cannot be ranked on coding. Pick GPT-4o (2024-08-06) for output tokens 2.0x cheaper ($10.00 vs $20.00 per million).
Which is cheaper, GPT-4o (2024-08-06) or GPT-5.6 Sol?
GPT-4o (2024-08-06) costs $2.50 per million input tokens and $10.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. Cost per solved task is known for GPT-5.6 Sol only.
Which has the bigger context window, GPT-4o (2024-08-06) or GPT-5.6 Sol?
GPT-5.6 Sol, with 1.05M tokens against 128K.
How many benchmarks is the GPT-4o (2024-08-06) vs GPT-5.6 Sol comparison based on?
49 benchmarks have a result for both models as of October 22, 2026. GPT-4o (2024-08-06)'s coding index rests on 0 independent benchmarks and GPT-5.6 Sol's on 6. Where only one model has a result, the page says so instead of naming a winner.