GPT-6 Sol vs Step 5 Preview
GPT-6 Sol leads Step 5 Preview on coding, 76.0 to 61.1 on the Vibe Coding Index, and Step 5 Preview costs 3.7x less per output token ($2.70 vs $10.00 per million). Updated October 22, 2026; 60 benchmarks have a result for both.
GPT-6 Sol or Step 5 Preview: which to pick
Pick GPT-6 Sol for coding: it scores 76.0 on the Vibe Coding Index against 61.1 for Step 5 Preview.
Pick Step 5 Preview for output tokens 3.7x cheaper ($2.70 vs $10.00 per million) and work measured by SciCode or LMArena Text: coding, where it leads.
- Shared results
- 60
- GPT-6 Sol only
- 41
- Step 5 Preview only
- 1
- Like-for-like categories
- 8 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
GPT-6 Sol
GPT-6 Sol scores 76.0 against 61.1.
5 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6 Sol
GPT-6 Sol leads, 47.6 against 43.7.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-6 Sol has a Design Arena: websites result, 1292.
Directional only
Long documents
Listed context window
GPT-6 Sol
GPT-6 Sol takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Step 5 Preview
GPT-6 Sol $0.0070, Step 5 Preview $0.0024 per turn.
List prices
At a glance
- Coding index
- GPT-6 Sol 76.0 from 5 benchmarks, Step 5 Preview 61.1 from 4 benchmarks.
- Widest category
- Agentic work, 21.0 points apart on average over 11 shared benchmarks.
- Widest single gap
- LiveBench browser: GPT-6 Sol 92.0% against Step 5 Preview 24.0%, 68.0 points apart on a 0 to 100 scale.
- Output price
- GPT-6 Sol $10.00 against Step 5 Preview $2.70 per million output tokens, 3.7x apart.
- Context window
- GPT-6 Sol takes 1.05M tokens, Step 5 Preview 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-6 Sol | Bars | Step 5 Preview | Ties |
|---|---|---|---|---|
| Coding | 9 | 3 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 7 | 4 | ||
| Reasoning | 4 | 4 | ||
| Math | 1 | 2 | ||
| Knowledge | 0 | 4 | ||
| Web design | 1 | 0 | ||
| General | 1 | 19 | ||
| All shared boards | 24 | 36 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index93
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench coding | 93.1% | 85.6% | GPT-6 Sol |
| LMArena WebDev | 1683 | 1567 | GPT-6 Sol |
| Terminal-Bench 4 (Vals AI) | 44.4% | 31.8% | GPT-6 Sol |
| Vibe Code Bench (Vals AI) | 87.8% | 70.4% | GPT-6 Sol |
| Code migration (Vals AI) | 57.2% | 39.0% | GPT-6 Sol |
| ProgramBench (Vals AI) | 2.0% | Not measured | Only GPT-6 Sol measured |
| IOI (Vals AI) | 82.6% | 38.1% | GPT-6 Sol |
| Terminal-Bench 2.1 (Vals AI) | 83.2% | Not measured | Only GPT-6 Sol measured |
| SWE-bench Multimodal (Vals AI) | Not measured | 40.8% | Only Step 5 Preview measured |
| CyberBench (Vals AI) | 78.0% | Not measured | Only GPT-6 Sol measured |
| SciCode | 57.6% | 58.9% | Step 5 Preview |
| FrontierCode | 49.3% | Not measured | Only GPT-6 Sol measured |
| ALE-Bench | 2462.0 | Not measured | Only GPT-6 Sol measured |
| LMArena Text: coding | 1448 | 1485 | Step 5 Preview |
| LMArena Text: software and IT | 1433 | 1473 | Step 5 Preview |
| LMArena WebDev: React | 1685 | 1583 | GPT-6 Sol |
| LMArena WebDev: HTML | 1685 | 1556 | GPT-6 Sol |
| LMArena WebDev: from an image | 1660 | 1550 | GPT-6 Sol |
| Neither model has a result on the other 21 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| AA Intelligence Index | 47.6 | 43.7 | GPT-6 Sol |
| Epoch Capabilities Index | 163.7 | Not measured | Only GPT-6 Sol measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index74
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | 1231 | Not measured | Only GPT-6 Sol measured |
| Design Arena: agents building full-stack apps | 1238 | Not measured | Only GPT-6 Sol measured |
| Design Arena: agents building mobile apps | 1217 | Not measured | Only GPT-6 Sol measured |
| LiveBench research | 69.3% | 72.8% | Step 5 Preview |
| LiveBench browser | 92.0% | 24.0% | GPT-6 Sol |
| LiveBench long agentic | 66.9% | 27.5% | GPT-6 Sol |
| SREBench (Vals AI) | 30.5% | 0.4% | GPT-6 Sol |
| Finance Agent (Vals AI) | 49.0% | 50.7% | Step 5 Preview |
| Tax Agent Bench (Vals AI) | 15.0% | 27.3% | Step 5 Preview |
| Legal Research Bench (Vals AI) | 28.9% | 40.4% | Step 5 Preview |
| Excel Modeling Benchmark (Vals AI) | 71.5% | 57.1% | GPT-6 Sol |
| BioMysteryBench (Vals AI) | 74.8% | 67.4% | GPT-6 Sol |
| Terminal-Bench-Science (Vals AI) | 30.0% | 2.9% | GPT-6 Sol |
| Vals Science Index | 45.0% | 29.6% | GPT-6 Sol |
| APEX-Agents | 54.3% | Not measured | Only GPT-6 Sol measured |
| SpireClimb | 7.5% | Not measured | Only GPT-6 Sol measured |
| Vending-Bench 2 | $14,428 | Not measured | Only GPT-6 Sol measured |
| Neither model has a result on the other 24 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index44
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.7% | 83.8% | GPT-6 Sol |
| MysteryMechanism (Vals AI) | 30.2% | 18.5% | GPT-6 Sol |
| Humanity's Last Exam (Artificial Analysis run) | 47.9% | 46.5% | GPT-6 Sol |
| GPQA Diamond (Epoch AI run) | 94.3% | Not measured | Only GPT-6 Sol measured |
| ARC-AGI | 95.5% | Not measured | Only GPT-6 Sol measured |
| ARC-AGI-2 | 89.6% | Not measured | Only GPT-6 Sol measured |
| Chess puzzles | 56.0% | Not measured | Only GPT-6 Sol measured |
| Mystery game puzzles | 56.0% | Not measured | Only GPT-6 Sol measured |
| EBR-bench | 53.3% | Not measured | Only GPT-6 Sol measured |
| LMArena Text: hard prompts | 1422 | 1461 | Step 5 Preview |
| LMArena Text: expert | 1437 | 1485 | Step 5 Preview |
| LMArena Text: hard prompts in English | 1420 | 1454 | Step 5 Preview |
| LMArena Vision: diagrams | 1270 | 1308 | Step 5 Preview |
| LMArena Vision: homework | 1286 | 1265 | GPT-6 Sol |
| Neither model has a result on the other 8 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | Not measured | Only GPT-6 Sol measured |
| FrontierMath, tiers 1 to 3 | 89.8% | Not measured | Only GPT-6 Sol measured |
| FrontierMath, tier 4 | 90.0% | Not measured | Only GPT-6 Sol measured |
| ProofBench | 83.0% | 42.0% | GPT-6 Sol |
| LMArena Text: math | 1407 | 1458 | Step 5 Preview |
| LMArena Text: mathematical work | 1424 | 1460 | Step 5 Preview |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| MedCode (Vals AI) | 47.1% | Not measured | Only GPT-6 Sol measured |
| SimpleQA Verified | 60.7% | Not measured | Only GPT-6 Sol measured |
| LMArena Text: science | 1389 | 1454 | Step 5 Preview |
| LMArena Text: medicine and healthcare | 1366 | 1439 | Step 5 Preview |
| LMArena Text: legal and government | 1396 | 1437 | Step 5 Preview |
| LMArena Text: business and finance | 1380 | 1435 | Step 5 Preview |
| FACTS Benchmark Suite | 72.5% | Not measured | Only GPT-6 Sol measured |
| Neither model has a result on the other 11 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| Design Arena: websites | 1292 | Not measured | Only GPT-6 Sol measured |
| Design Arena: UI components | 1290 | Not measured | Only GPT-6 Sol measured |
| Design Arena: game dev | 1311 | Not measured | Only GPT-6 Sol measured |
| Design Arena: data viz | 1269 | Not measured | Only GPT-6 Sol measured |
| Design Arena: 3D | 1314 | Not measured | Only GPT-6 Sol measured |
| Design Arena: all code categories | 1300 | Not measured | Only GPT-6 Sol measured |
| Design Arena: SVG | 1315 | Not measured | Only GPT-6 Sol measured |
| Design Arena: ASCII art | 1222 | Not measured | Only GPT-6 Sol measured |
| LiveBench design | 82.2% | 76.9% | GPT-6 Sol |
GeneralLike-for-likePublic boards, shown as published, kept out of the index119
| Benchmark | GPT-6 Sol | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench data analysis | 81.2% | 63.5% | GPT-6 Sol |
| Public Benefits Bench (Vals AI) | 56.6% | 58.1% | Step 5 Preview |
| SAGE (Vals AI) | 44.8% | Not measured | Only GPT-6 Sol measured |
| MedScribe (Vals AI) | 82.0% | Not measured | Only GPT-6 Sol measured |
| Long context reasoning (AA-LCR) | 83.7% | 88.3% | Step 5 Preview |
| DTBench | 97.3% | Not measured | Only GPT-6 Sol measured |
| LMCA | 59.1% | Not measured | Only GPT-6 Sol measured |
| Furniture assembly | 58.3% | Not measured | Only GPT-6 Sol measured |
| LMArena Text | 1398 | 1440 | Step 5 Preview |
| LMArena Text: instruction following | 1413 | 1438 | Step 5 Preview |
| LMArena Text: creative writing | 1378 | 1409 | Step 5 Preview |
| LMArena Vision | 1240 | 1265 | Step 5 Preview |
| LMArena Text: English | 1396 | 1447 | Step 5 Preview |
| LMArena Text: non-English | 1388 | 1428 | Step 5 Preview |
| LMArena Text: Chinese | 1412 | 1500 | Step 5 Preview |
| LMArena Text: German | 1379 | Not measured | Only GPT-6 Sol measured |
| LMArena Text: Japanese | 1377 | 1383 | Step 5 Preview |
| LMArena Text: Korean | 1336 | Not measured | Only GPT-6 Sol measured |
| LMArena Text: French | 1399 | 1438 | Step 5 Preview |
| LMArena Text: Spanish | 1387 | 1441 | Step 5 Preview |
| LMArena Text: Russian | 1402 | 1433 | Step 5 Preview |
| LMArena Text: Polish | 1372 | Not measured | Only GPT-6 Sol measured |
| LMArena Text: multi-turn | 1414 | 1437 | Step 5 Preview |
| LMArena Text: longer queries | 1416 | 1449 | Step 5 Preview |
| LMArena Text: writing and language | 1389 | 1425 | Step 5 Preview |
| LMArena Text: entertainment and media | 1373 | 1412 | Step 5 Preview |
| LMArena Vision: English | 1229 | 1290 | Step 5 Preview |
| LMArena Vision: reading text | 1258 | 1282 | Step 5 Preview |
| LMArena Vision: creative writing | 1219 | Not measured | Only GPT-6 Sol measured |
| Neither model has a result on the other 17 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6 Sol | Step 5 Preview | 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
Step 5 Preview costs less
Repository review
50K input + 3K output tokens
Step 5 Preview costs less
Agent loop
200K input + 10K output tokens
Step 5 Preview 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-6 Sol | StepFun Step 5 Preview |
|---|---|---|
| Maker | OpenAI | StepFun |
| Weights | No public weights listed | Open weights |
| Released | September 22, 2026 | October 8, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $2.00 | $1.00 |
| Output $/Mtok | $10.00 | $2.70 |
| Coding index | 76.0 | 61.1 |
| Independent measurements behind it | 5 | 4 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6 Sol better than Step 5 Preview for coding?
Pick GPT-6 Sol for coding: it scores 76.0 on the Vibe Coding Index against 61.1 for Step 5 Preview. Pick Step 5 Preview for output tokens 3.7x cheaper ($2.70 vs $10.00 per million) and work measured by SciCode or LMArena Text: coding, where it leads.
Which is cheaper, GPT-6 Sol or Step 5 Preview?
GPT-6 Sol costs $2.00 per million input tokens and $10.00 per million output tokens; Step 5 Preview costs $1.00 and $2.70. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6 Sol or Step 5 Preview?
GPT-6 Sol, with 1.05M tokens against 1.05M.
How many benchmarks is the GPT-6 Sol vs Step 5 Preview comparison based on?
60 benchmarks have a result for both models as of October 22, 2026. GPT-6 Sol's coding index rests on 5 independent benchmarks and Step 5 Preview's on 4. Where only one model has a result, the page says so instead of naming a winner.