# GPT-5.5 vs Inkling

> Side-by-side benchmark comparison for GPT-5.5 and Inkling across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-vs-inkling
- Last updated: October 14, 2026

- Shared sourced benchmarks: 15
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-5.5 if you want the stronger benchmark profile. Inkling only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.5 leads overall 68.42 to 52.13.
- The clearest category separation is in mathematics, where the averages are 91.2 for GPT-5.5 and 58.3 for Inkling.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 72.500% and 4.878%.
- Inkling is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | GPT-5.5 | Inkling |
|----------|----------|----------|
| Creator | OpenAI | Thinking Machines Lab |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 1M | 1M |
| Overall Score | 68.42 | 52.13 |
| Benchmarks Covered | 41 | 24 |
| Pricing (input/output) | $5.00 / $30.00 | $1.87 / $4.68 |

## Category Breakdown

### Agentic

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 61.5 (Supported · #21/124)
- Inkling public-lane score: 36.2 (Supported · #72/124)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 82% | Coming soon | Coming soon |
| CyberGym | 81.8% | Coming soon | Coming soon |
| BrowseComp | 84.4% | 77.1% | GPT-5.5 |
| OSWorld-Verified | 78.7% | Coming soon | Coming soon |
| MCP Atlas | 75.3% | 74.1% | GPT-5.5 |
| Toolathlon | 55.6% | Coming soon | Coming soon |
| τ²-bench results | 98% | Coming soon | Coming soon |
| Gert Labs | 72.93% | Coming soon | Coming soon |
| ResearchClawBench | 17.0% | Coming soon | Coming soon |
| OSWorld 2.0 | 13.0% | Coming soon | Coming soon |
| JobBench | 42.7% | Coming soon | Coming soon |
| ExploitGym | 13.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 76.4% | 47.6% | GPT-5.5 |
| ApprenticeBench | 20% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 63.8% | Coming soon |
| CWE-bench v1 | Coming soon | 37.0% | Coming soon |

### Coding

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 62.1 (Supported · #15/149)
- Inkling public-lane score: 34 (Supported · #80/149)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 58.6% | 54.3% | GPT-5.5 |
| Terminal-Bench 2.0 | 82.0% | Coming soon | Coming soon |
| Vibe Code Bench | 69.85% | Coming soon | Coming soon |
| React Native Evals | 84.7% | Coming soon | Coming soon |
| cursorBench31 | 59.2% | Coming soon | Coming soon |
| CursorBench 3.2 | 58.4% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 43.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.3% | 85.5% | Inkling |
| SWE-bench (Vals) | 82.6% | 77.6% | GPT-5.5 |
| PostTrainBench v1.1 | 27.2% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 63.8% | Coming soon |
| FrontierSWE v2 | Coming soon | 4.1% | Coming soon |

### Reasoning

- Winner: Directional only
- GPT-5.5 public-lane score: 70.4 (#21/29)
- Inkling public-lane score: 79 (#14/29)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | 83.1% | Coming soon | Coming soon |
| MRCR v2 128K-256K | 87.5% | Coming soon | Coming soon |
| ARC-AGI-2 | 85% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.4% | Coming soon | Coming soon |
| ARC-AGI-1 | 95.00% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- GPT-5.5 public-lane score: 75.5 (#23/54)
- Inkling public-lane score: 67.5 (#35/54)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | 73.5% | GPT-5.5 |
| MMMU-Pro w/ Python | 83.2% | Coming soon | Coming soon |
| OfficeQA Pro | 54.1% | Coming soon | Coming soon |
| CharXiv | Coming soon | 82% | Coming soon |
| CharXiv w/o tools | Coming soon | 78.1% | Coming soon |

### Knowledge

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 71.4 (Supported · #14/181)
- Inkling public-lane score: 54.5 (Supported · #62/181)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | 87.9% | GPT-5.5 |
| GPQA-D | 93.6% | 87.9% | GPT-5.5 |
| HLE | 52.2% | 46% | GPT-5.5 |
| HLE w/o tools | 41.4% | 30% | GPT-5.5 |
| GPQA Diamond (Vals) | 93.2% | 87.1% | GPT-5.5 |
| MMLU-Pro (Vals) | 88.1% | 86.3% | GPT-5.5 |

### Instruction Following

- Winner: Directional only
- GPT-5.5 public-lane score: 93.3 (#8/128)
- Inkling public-lane score: 87.6 (#35/128)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 79.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- GPT-5.5 public-lane score: 91.2 (Unranked · 3 rankable rows)
- Inkling public-lane score: 58.3 (#11/12)

| Benchmark | GPT-5.5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 51.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 85.263% | 33.333% | GPT-5.5 |
| FrontierMath v2 (Tier 4) | 72.500% | 4.878% | GPT-5.5 |
| AIME26 | Coming soon | 97.1% | Coming soon |

## FAQ

### Which is better overall, GPT-5.5 or Inkling?

GPT-5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.5 and Inkling?

The widest category gap is in mathematics, where the averages are 91.2 for GPT-5.5 and 58.3 for Inkling.

### How many benchmarks does GPT-5.5 cover on BenchLM?

GPT-5.5 currently has 41 sourced benchmark scores on BenchLM.

### How many benchmarks does Inkling cover on BenchLM?

Inkling currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.5 vs GPT-5.5 Pro](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Inkling vs GPT-5.5 Pro](/compare/gpt-5-5-pro-vs-inkling)
- [GPT-5.5 vs Inkling-Small](/compare/gpt-5-5-vs-inkling-small)
- [Inkling vs Inkling-Small](/compare/inkling-vs-inkling-small)

## Explore More

- [GPT-5.5 profile](/models/gpt-5-5)
- [Inkling profile](/models/inkling)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)