# GPT-5.5 Pro vs Inkling

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 44.1 on the Noometry Index. Inkling costs 26× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-inkling
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Inkling in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 31.2.
- The biggest single-benchmark swing is FrontierMath Tier 4: 78% for GPT-5.5 Pro and 4.9% for Inkling.
- Inkling is cheaper at $1.87 / $4.68 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 66K.
- Inkling has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Inkling |
|---|---|---|
| Provider | OpenAI | Thinking Machines Lab |
| Noometry Index | 64.3 | 44.1 |
| Rank | 7 | 75 |
| Context | 1.05M | 66K |
| Input $/M | $30 | $1.87 |
| Output $/M | $180 | $4.68 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Pro: —
- Inkling: 34.1 (#229)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| FrontierCode | — | 14% |
| LMArena WebDev | — | 1412 |
| FrontierSWE | — | 4.1% |
| SciCode | — | 47% |
| WeirdML | — | 32.3% |
| LMArena Coding | — | 1463 |
| ALE-Bench | — | 946 |

## Agentic & Tool Use

- GPT-5.5 Pro: —
- Inkling: 29.5 (#76)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| APEX-Agents | — | 33.8% |
| τ²-bench Banking | — | 25% |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Inkling: 40.6 (#48)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| ARC-AGI-2 | 84.6% | 36.5% |
| SimpleBench | 76.9% | 50% |
| ARC-AGI-1 | 96.5% | 79.5% |
| CritPt | 30.6% | 5.4% |
| Chess Puzzles | 64% | 21% |
| DTBench | 96% | 87.5% |
| LMCA | 53.9% | 37.6% |
| Epoch Capabilities Index | 162.45 | 148.6 |
| LMArena Hard Prompts | — | 1452 |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Inkling: 31.2 (#198)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | 33.3% |
| FrontierMath Tier 4 | 78% | 4.9% |
| OTIS Mock AIME 2024-2025 | 100% | 88.9% |
| ProofBench | — | 0% |
| LMArena Math | — | 1482 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Inkling: 55.2 (#44)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| GPQA Diamond | 93.9% | 88.3% |
| SimpleQA Verified | — | 40.3% |
| LMArena Expert | — | 1468 |

## Multilingual

- GPT-5.5 Pro: —
- Inkling: 54.2 (#49)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| LMArena Non-English | — | 1434 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1453 |
| LMArena German | — | 1456 |
| LMArena Japanese | — | 1428 |
| LMArena Korean | — | 1401 |
| LMArena Russian | — | 1430 |
| LMArena Spanish | — | 1442 |

## Instruction Following

- GPT-5.5 Pro: —
- Inkling: 75.3 (#65)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| LMArena Instruction Following | — | 1427 |

## Long Context

- GPT-5.5 Pro: —
- Inkling: 43.9 (#79)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| LMArena Longer Query | — | 1436 |

## Writing & Preference

- GPT-5.5 Pro: —
- Inkling: 65.5 (#48)

| Benchmark | GPT-5.5 Pro | Inkling |
|---|---|---|
| LMArena Text | — | 1443 |
| LMArena Creative Writing | — | 1390 |
| EQ-Bench Creative Writing | — | 1611 |
| EQ-Bench 4 | — | 1226 |
| LMArena Multi-Turn | — | 1436 |

## FAQ

### Is GPT-5.5 Pro better than Inkling?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 44.1 on the Noometry Index. Inkling costs 26× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 Pro or Inkling?

Inkling is cheaper. It lists at $1.87 per million input tokens and $4.68 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 66K.

### How many benchmarks do GPT-5.5 Pro and Inkling share?

12 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Inkling has 41.