Model comparison
GPT-5 Pro vs Inkling-Small
GPT-5 Pro and Inkling-Small score almost the same on the Noometry Index (46.4 vs 46.5), so choose on price, context window or the category you care about most.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. GPT-5 Pro scores higher in 4 categories and Inkling-Small in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5 Pro leads 56.7 to 48.2.
- The biggest single-benchmark swing is ARC-AGI-2: 18.3% for GPT-5 Pro and 40.1% for Inkling-Small.
- Inkling-Small is cheaper at $0.45 / $1.20 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- Inkling-Small accepts more context: 524K tokens versus 400K.
- Inkling-Small has downloadable open weights; the other is API-only.
Side by side
| GPT-5 Pro | Inkling-Small | |
|---|---|---|
| Provider | OpenAI | Thinking Machines Lab |
| Noometry Index | 46.4 | 46.5 |
| Released | 2025-10-06 | 2026-07-15 |
| Weights | Proprietary | Open |
| Context window | 400K | 524K |
| Max output | 272K | 1.05M |
| Input $ / M tokens | $15 | $0.45 |
| Output $ / M tokens | $120 | $1.20 |
| Results tracked | 12 | 33 |
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Category by category
Coding Too close to call
GPT-5 Pro: 44.0 (#80), Inkling-Small: 43.6 (#85)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| LMArena WebDev | — | 1409 |
| SciCode | — | 48.7% |
| WeirdML | 60.4% | — |
| LMArena Coding | — | 1451 |
| AlgoTune | 1.31 | — |
Reasoning Too close to call
GPT-5 Pro: 38.9 (#62), Inkling-Small: 38.6 (#63)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| ARC-AGI-2 | 18.3% | 40.1% |
| ARC-AGI-1 | 70.2% | 84% |
| Epoch Capabilities Index | 150.28 | 150.15 |
| SimpleBench | 61.6% | — |
| Kagi LLM Benchmark | 76.8% | — |
| CritPt | — | 8.3% |
| Chess Puzzles | — | 18% |
| EnigmaEval | 18.8% | — |
| LMArena Hard Prompts | — | 1423 |
| Mystery Game Puzzles | — | 6% |
Math GPT-5 Pro leads
GPT-5 Pro: 48.5 (#63), Inkling-Small: 45.1 (#77)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | 46.3% |
| FrontierMath Tier 4 | 19.5% | 17.1% |
| OTIS Mock AIME 2024-2025 | — | 90% |
| ProofBench | — | 6% |
| LMArena Math | — | 1459 |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge GPT-5 Pro leads
GPT-5 Pro: 56.7 (#42), Inkling-Small: 48.2 (#77)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| GPQA Diamond | — | 88.5% |
| Humanity's Last Exam | 31.6% | — |
| SimpleQA Verified | — | 19.1% |
| LMArena Expert | — | 1442 |
Multimodal Not comparable
GPT-5 Pro: —, Inkling-Small: 39.1 (#62)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| LMArena Vision | — | 1235 |
Multilingual Not comparable
GPT-5 Pro: —, Inkling-Small: 51.7 (#104)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| LMArena Non-English | — | 1402 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1436 |
| LMArena German | — | 1405 |
| LMArena Japanese | — | 1405 |
| LMArena Korean | — | 1363 |
| LMArena Russian | — | 1391 |
| LMArena Spanish | — | 1428 |
Instruction Following Not comparable
GPT-5 Pro: —, Inkling-Small: 73.8 (#114)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| LMArena Instruction Following | — | 1399 |
Long Context Not comparable
GPT-5 Pro: —, Inkling-Small: 42.7 (#118)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| LMArena Longer Query | — | 1401 |
Writing & Preference Not comparable
GPT-5 Pro: —, Inkling-Small: 59.6 (#107)
| Benchmark | GPT-5 Pro | Inkling-Small |
|---|---|---|
| LMArena Text | — | 1414 |
| LMArena Creative Writing | — | 1331 |
| EQ-Bench Creative Writing | — | 1491 |
| LMArena Multi-Turn | — | 1418 |
Frequently asked questions
Is GPT-5 Pro better than Inkling-Small?
GPT-5 Pro and Inkling-Small score almost the same on the Noometry Index (46.4 vs 46.5), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5 Pro 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 Pro lists at $15 and $120.
Is GPT-5 Pro or Inkling-Small better for coding?
They score almost the same on coding (44.0 vs 43.6); test both on your own repository before choosing.
Which has the bigger context window?
Inkling-Small does, with 524K tokens against 400K.
How many benchmarks do GPT-5 Pro and Inkling-Small share?
5 benchmarks have published results for both models. GPT-5 Pro has 12 scored results on Noometry and Inkling-Small has 33.