Model comparison
GPT-5.5 vs Inkling-Small
GPT-5.5 is the stronger model overall, scoring 63.4 to 46.5 on the Noometry Index. Inkling-Small costs 18× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.
Last verified . 33 shared benchmarks.
Summary
- They share 33 benchmarks with published results for both. GPT-5.5 scores higher in 9 categories and Inkling-Small in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 leads 81.5 to 44.9.
- The biggest single-benchmark swing is FrontierMath Tier 4: 72.5% for GPT-5.5 and 17.1% for Inkling-Small.
- Inkling-Small is cheaper at $0.45 / $1.20 per million input/output tokens, against $5 / $30 for GPT-5.5.
- GPT-5.5 accepts more context: 1.05M tokens versus 524K.
- Inkling-Small has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 | Inkling-Small | |
|---|---|---|
| Provider | OpenAI | Thinking Machines Lab |
| Noometry Index | 63.4 | 46.5 |
| Released | 2026-04-23 | 2026-07-15 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 524K |
| Max output | 128K | 1.05M |
| Input $ / M tokens | $5 | $0.45 |
| Output $ / M tokens | $30 | $1.20 |
| Results tracked | 71 | 33 |
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Category by category
Coding GPT-5.5 leads
GPT-5.5: 58.3 (#13), Inkling-Small: 43.3 (#80)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| LMArena WebDev | 1512 | 1408 |
| SciCode | 56.1% | 48.7% |
| LMArena Coding | 1494 | 1451 |
| SWE-bench Verified | 80.6% | — |
| DeepSWE | 67% | — |
| FrontierCode | 43% | — |
| GSO | 40.2% | — |
| WeirdML | 84.9% | — |
| MirrorCode | 10% | — |
| ALE-Bench | 1,943 | — |
Agentic & Tool Use Not comparable
GPT-5.5: 50.7 (#6), Inkling-Small: —
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| Terminal-Bench | 84.7% | — |
| APEX-Agents | 55.1% | — |
| OSWorld 2.0 | 13% | — |
| Remote Labor Index | 6.3% | — |
| τ²-bench Banking | 44.6% | — |
| DeepResearch Bench | 54% | — |
| PostTrainBench | 27.2% | — |
| ExploitBench | 47.4% | — |
| GBAEval | 53.2% | — |
| GDP.pdf | 26% | — |
| LMArena Search | 1242 | — |
| Vending-Bench 2 | 7,524 | — |
Reasoning GPT-5.5 leads
GPT-5.5: 72.7 (#8), Inkling-Small: 39.0 (#53)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| ARC-AGI-2 | 85% | 40.1% |
| ARC-AGI-1 | 95% | 84% |
| CritPt | 27.1% | 8.3% |
| Chess Puzzles | 54% | 18% |
| LMArena Hard Prompts | 1489 | 1424 |
| Mystery Game Puzzles | 56% | 6% |
| Epoch Capabilities Index | 159.25 | 150.13 |
| SimpleBench | 69% | — |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 96.2% | — |
| EBR-Bench | 34.3% | — |
| DTBench | 96% | — |
| LMCA | 54.3% | — |
| Surface Evolver Bench | 88.1% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 60.6 | — |
Math GPT-5.5 leads
GPT-5.5: 81.5 (#9), Inkling-Small: 44.9 (#65)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.3% | 46.3% |
| FrontierMath Tier 4 | 72.5% | 17.1% |
| OTIS Mock AIME 2024-2025 | 100% | 90% |
| ProofBench | 50% | 6% |
| LMArena Math | 1486 | 1453 |
| MathArena Final-Answer Competitions | 94.3% | — |
| FrontierMath (Feb 2025 set) | 51.7% | — |
| FrontierMath Erdős | 0% | — |
| FrontierMath Tier 4 (v1) | 35.4% | — |
Knowledge GPT-5.5 leads
GPT-5.5: 64.4 (#14), Inkling-Small: 48.3 (#71)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| GPQA Diamond | 94% | 88.5% |
| SimpleQA Verified | 63% | 19.1% |
| LMArena Expert | 1508 | 1442 |
| Vectara Hallucination Rate | 9.3% | — |
Multimodal GPT-5.5 leads
GPT-5.5: 47.1 (#11), Inkling-Small: 38.4 (#59)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| LMArena Vision | 1297 | 1235 |
| Blueprint-Bench 2 | 36.2% | — |
| Furniture Assembly | 44.2% | — |
| LMArena Document | 1486 | — |
Multilingual GPT-5.5 leads
GPT-5.5: 56.5 (#19), Inkling-Small: 51.7 (#102)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| LMArena Non-English | 1467 | 1400 |
| LMArena Chinese | 1535 | 1458 |
| LMArena French | 1486 | 1438 |
| LMArena German | 1478 | 1412 |
| LMArena Japanese | 1498 | 1399 |
| LMArena Korean | 1461 | 1355 |
| LMArena Russian | 1473 | 1392 |
| LMArena Spanish | 1469 | 1426 |
Instruction Following GPT-5.5 leads
GPT-5.5: 77.7 (#18), Inkling-Small: 73.9 (#112)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| LMArena Instruction Following | 1479 | 1397 |
Long Context GPT-5.5 leads
GPT-5.5: 48.3 (#12), Inkling-Small: 42.7 (#113)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| LMArena Longer Query | 1484 | 1401 |
| CL-bench Life | 22.2% | — |
Writing & Preference GPT-5.5 leads
GPT-5.5: 72.8 (#13), Inkling-Small: 59.8 (#102)
| Benchmark | GPT-5.5 | Inkling-Small |
|---|---|---|
| LMArena Text | 1471 | 1413 |
| LMArena Creative Writing | 1455 | 1330 |
| EQ-Bench Creative Writing | 1844 | 1491 |
| LMArena Multi-Turn | 1477 | 1420 |
| EQ-Bench 4 | 1315 | — |
Frequently asked questions
Is GPT-5.5 better than Inkling-Small?
GPT-5.5 is the stronger model overall, scoring 63.4 to 46.5 on the Noometry Index. Inkling-Small costs 18× less per token, which makes it the better buy when GPT-5.5's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 or Inkling-Small?
Inkling-Small is cheaper. It lists at $0.45 per million input tokens and $1.20 per million output tokens; GPT-5.5 lists at $5 and $30.
Is GPT-5.5 or Inkling-Small better for coding?
GPT-5.5 scores higher on coding benchmarks: 58.3 versus 43.3 in the Noometry coding category.
Which has the bigger context window?
GPT-5.5 does, with 1.05M tokens against 524K.
How many benchmarks do GPT-5.5 and Inkling-Small share?
33 benchmarks have published results for both models. GPT-5.5 has 71 scored results on Noometry and Inkling-Small has 33.