GPT-6.1 Terra vs Inkling 2 Small
GPT-6.1 Terra leads Inkling 2 Small on coding, 76.4 to 48.9 on the Vibe Coding Index, and Inkling 2 Small costs 5.0x less per output token ($1.00 vs $5.00 per million). Updated November 14, 2026; 20 benchmarks have a result for both.
GPT-6.1 Terra or Inkling 2 Small: which to pick
Pick GPT-6.1 Terra for coding: it scores 76.4 on the Vibe Coding Index against 48.9 for Inkling 2 Small.
Pick Inkling 2 Small for output tokens 5.0x cheaper ($1.00 vs $5.00 per million) and work measured by Tax Agent Bench (Vals AI) or Legal Research Bench (Vals AI), where it leads.
- Shared results
- 20
- GPT-6.1 Terra only
- 35
- Inkling 2 Small only
- 31
- Like-for-like categories
- 6 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-6.1 Terra
GPT-6.1 Terra scores 76.4 against 48.9.
4 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6.1 Terra
GPT-6.1 Terra leads, 51.3 against 30.6.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-6.1 Terra has a Design Arena: websites result, 1287.
Directional only
General
Vals Index
GPT-6.1 Terra
GPT-6.1 Terra leads, 60.5% against 56.1%.
Same board, both measured
Long documents
Listed context window
GPT-6.1 Terra
GPT-6.1 Terra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Inkling 2 Small
GPT-6.1 Terra $0.0035, Inkling 2 Small $0.0008 per turn.
List prices
At a glance
- Coding index
- GPT-6.1 Terra 76.4 from 4 benchmarks, Inkling 2 Small 48.9 from 3 benchmarks.
- Widest category
- Agentic work, 21.0 points apart on average over 4 shared benchmarks.
- Widest single gap
- Terminal-Bench 4 (Vals AI): GPT-6.1 Terra 49.5% against Inkling 2 Small 12.6%, 49.1 points apart on a 0 to 100 scale.
- Output price
- GPT-6.1 Terra $5.00 against Inkling 2 Small $1.00 per million output tokens, 5.0x apart.
- Context window
- GPT-6.1 Terra takes 1.05M tokens, Inkling 2 Small 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-6.1 Terra | Bars | Inkling 2 Small | Ties |
|---|---|---|---|---|
| Coding | 8 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 1 | 3 | ||
| Reasoning | 3 | 0 | ||
| Knowledge | 1 | 0 | ||
| General | 1 | 2 | ||
| All shared boards | 15 | 5 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| LiveBench coding | 89.2% | Not measured | Only GPT-6.1 Terra measured |
| LMArena WebDev | 1678 | 1647 | GPT-6.1 Terra |
| Terminal-Bench 4 (Vals AI) | 49.5% | 12.6% | GPT-6.1 Terra |
| Vibe Code Bench (Vals AI) | 84.0% | 81.5% | GPT-6.1 Terra |
| ProgramBench (Vals AI) | Not measured | 0.5% | Only Inkling 2 Small measured |
| SWE-bench Multimodal (Vals AI) | Not measured | 43.1% | Only Inkling 2 Small measured |
| CyberBench (Vals AI) | Not measured | 72.7% | Only Inkling 2 Small measured |
| SciCode | 55.1% | 52.3% | GPT-6.1 Terra |
| Terminal-Bench 4.0 (Artificial Analysis run) | 55.6% | 13.1% | GPT-6.1 Terra |
| FrontierCode 2.0 | 42.3% | 25.4% | GPT-6.1 Terra |
| MirrorCode | 76.7% | Not measured | Only GPT-6.1 Terra measured |
| ALE-Bench | 2608.8 | Not measured | Only GPT-6.1 Terra measured |
| LMArena Text: coding | Not measured | 1455 | Only Inkling 2 Small measured |
| LMArena Text: software and IT | Not measured | 1443 | Only Inkling 2 Small measured |
| LMArena WebDev: React | 1664 | 1660 | GPT-6.1 Terra |
| LMArena WebDev: HTML | 1740 | 1661 | GPT-6.1 Terra |
| SWE-Bench Pro V2 | Not measured | 97.7% | Only Inkling 2 Small measured |
| GameBench 2 | 85.8 | Not measured | Only GPT-6.1 Terra measured |
| Terminal-Bench 4.0 | 51.8% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 33 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| AA Intelligence Index | 51.3 | 30.6 | GPT-6.1 Terra |
| Epoch Capabilities Index | 167.7 | Not measured | Only GPT-6.1 Terra measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index13
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| Design Arena: agents building mobile apps | 1169 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: spreadsheets | 1027 | Not measured | Only GPT-6.1 Terra measured |
| LiveBench research | 79.1% | Not measured | Only GPT-6.1 Terra measured |
| LiveBench browser | 93.1% | Not measured | Only GPT-6.1 Terra measured |
| LiveBench long agentic | 56.2% | Not measured | Only GPT-6.1 Terra measured |
| SREBench (Vals AI) | Not measured | 1.9% | Only Inkling 2 Small measured |
| Tax Agent Bench (Vals AI) | 17.1% | 38.9% | Inkling 2 Small |
| Legal Research Bench (Vals AI) | 26.0% | 46.6% | Inkling 2 Small |
| Harvey's Legal Agent Benchmark (Vals AI) | 1.7% | 21.7% | Inkling 2 Small |
| BioMysteryBench (Vals AI) | Not measured | 70.0% | Only Inkling 2 Small measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 2.9% | Only Inkling 2 Small measured |
| Vals Science Index | Not measured | 32.7% | Only Inkling 2 Small measured |
| APEX-Agents | 68.3% | 46.8% | GPT-6.1 Terra |
| SpireClimb | 22.3% | Not measured | Only GPT-6.1 Terra measured |
| Vending-Bench 2 | $9,107 | Not measured | Only GPT-6.1 Terra measured |
| MCP Atlas | Not measured | 85.4% | Only Inkling 2 Small measured |
| Neither model has a result on the other 28 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.7% | Not measured | Only GPT-6.1 Terra measured |
| MysteryMechanism (Vals AI) | Not measured | 25.2% | Only Inkling 2 Small measured |
| Humanity's Last Exam (Artificial Analysis run) | 46.2% | 44.1% | GPT-6.1 Terra |
| HLE-Diamond (Artificial Analysis run) | 47.3% | 28.7% | GPT-6.1 Terra |
| CritPt v2, hard subset (Artificial Analysis run) | 68.0% | 35.0% | GPT-6.1 Terra |
| GPQA Diamond (Epoch AI run) | 94.3% | Not measured | Only GPT-6.1 Terra measured |
| ARC-AGI | Not measured | 96.5% | Only Inkling 2 Small measured |
| ARC-AGI-2 | Not measured | 81.7% | Only Inkling 2 Small measured |
| SimpleBench | 72.2% | Not measured | Only GPT-6.1 Terra measured |
| Mystery game puzzles | 74.0% | Not measured | Only GPT-6.1 Terra measured |
| EBR-bench | 78.1% | Not measured | Only GPT-6.1 Terra measured |
| LMArena Text: hard prompts | Not measured | 1421 | Only Inkling 2 Small measured |
| LMArena Text: expert | Not measured | 1478 | Only Inkling 2 Small measured |
| LMArena Text: hard prompts in English | Not measured | 1424 | Only Inkling 2 Small measured |
| Humanity's Last Exam (Scale run) | 35.7% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 11 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | Not measured | Only GPT-6.1 Terra measured |
| FrontierMath, tiers 1 to 3 | 90.9% | Not measured | Only GPT-6.1 Terra measured |
| FrontierMath, tier 4 | 92.7% | Not measured | Only GPT-6.1 Terra measured |
| MathArena | Not measured | 42.4% | Only Inkling 2 Small measured |
| Neither model has a result on the other 10 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| AA-Omniscience | 29.6 | 16.1 | GPT-6.1 Terra |
| SimpleQA Verified | 57.3% | Not measured | Only GPT-6.1 Terra measured |
| LMArena Text: science | Not measured | 1409 | Only Inkling 2 Small measured |
| LMArena Text: business and finance | Not measured | 1415 | Only Inkling 2 Small measured |
| FACTS Benchmark Suite | 74.1% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 16 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| Design Arena: websites | 1287 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: UI components | 1289 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: game dev | 1332 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: data viz | 1164 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: 3D | 1295 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: all code categories | 1299 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: SVG | 1290 | Not measured | Only GPT-6.1 Terra measured |
| LiveBench design | 79.7% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | Leader |
|---|---|---|---|
| Vals Index | 60.5% | 56.1% | GPT-6.1 Terra |
| LiveBench data analysis | 82.3% | Not measured | Only GPT-6.1 Terra measured |
| SAGE (Vals AI) | Not measured | 88.6% | Only Inkling 2 Small measured |
| Long context reasoning (AA-LCR) | 82.7% | 83.3% | Inkling 2 Small |
| GDPval-AA | 1476 | 1630 | Inkling 2 Small |
| Furniture assembly | 79.2% | Not measured | Only GPT-6.1 Terra measured |
| LMArena Text | Not measured | 1403 | Only Inkling 2 Small measured |
| LMArena Text: instruction following | Not measured | 1408 | Only Inkling 2 Small measured |
| LMArena Text: creative writing | Not measured | 1348 | Only Inkling 2 Small measured |
| LMArena Text: English | Not measured | 1418 | Only Inkling 2 Small measured |
| LMArena Text: non-English | Not measured | 1390 | Only Inkling 2 Small measured |
| LMArena Text: Russian | Not measured | 1377 | Only Inkling 2 Small measured |
| LMArena Text: multi-turn | Not measured | 1408 | Only Inkling 2 Small measured |
| LMArena Text: longer queries | Not measured | 1403 | Only Inkling 2 Small measured |
| LMArena Text: writing and language | Not measured | 1381 | Only Inkling 2 Small measured |
| LMArena Text: entertainment and media | Not measured | 1359 | Only Inkling 2 Small measured |
| MultiChallenge | 74.2% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 32 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6.1 Terra | Inkling 2 Small | 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
Inkling 2 Small costs less
Repository review
50K input + 3K output tokens
Inkling 2 Small costs less
Agent loop
200K input + 10K output tokens
Inkling 2 Small 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-6.1 Terra | Thinking Machines Inkling 2 Small |
|---|---|---|
| Maker | OpenAI | Thinking Machines |
| Weights | No public weights listed | Open weights |
| Released | October 26, 2026 | November 9, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.00 | $0.30 |
| Output $/Mtok | $5.00 | $1.00 |
| Coding index | 76.4 | 48.9 |
| Independent measurements behind it | 4 | 3 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6.1 Terra better than Inkling 2 Small for coding?
Pick GPT-6.1 Terra for coding: it scores 76.4 on the Vibe Coding Index against 48.9 for Inkling 2 Small. Pick Inkling 2 Small for output tokens 5.0x cheaper ($1.00 vs $5.00 per million) and work measured by Tax Agent Bench (Vals AI) or Legal Research Bench (Vals AI), where it leads.
Which is cheaper, GPT-6.1 Terra or Inkling 2 Small?
GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens; Inkling 2 Small costs $0.30 and $1.00. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6.1 Terra or Inkling 2 Small?
GPT-6.1 Terra, with 1.05M tokens against 1.05M.
How many benchmarks is the GPT-6.1 Terra vs Inkling 2 Small comparison based on?
20 benchmarks have a result for both models as of November 14, 2026. GPT-6.1 Terra's coding index rests on 4 independent benchmarks and Inkling 2 Small's on 3. Where only one model has a result, the page says so instead of naming a winner.