# GPT-5.5 Pro vs Inkling

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

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

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

GPT-5.5 Pro leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- GPT-5.5 Pro has the higher overall point estimate 72.91 to 52.13. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in mathematics, where the averages are 94 for GPT-5.5 Pro and 58.3 for Inkling.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 78.049% 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 Pro | Inkling |
|----------|----------|----------|
| Creator | OpenAI | Thinking Machines Lab |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 1M | 1M |
| Overall Score | 72.91 | 52.13 |
| Benchmarks Covered | 8 | 24 |
| Pricing (input/output) | $30.00 / $180.00 | $1.87 / $4.68 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: Coming soon
- Inkling public-lane score: 36.2 (Supported · #72/124)

| Benchmark | GPT-5.5 Pro | Inkling | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 90.1% | 77.1% | GPT-5.5 Pro |
| Terminal-Bench 2.1 | Coming soon | 63.8% | Coming soon |
| MCP Atlas | Coming soon | 74.1% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 47.6% | Coming soon |
| CWE-bench v1 | Coming soon | 37.0% | Coming soon |

### Coding

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: Coming soon
- Inkling public-lane score: 34 (Supported · #80/149)

| Benchmark | GPT-5.5 Pro | Inkling | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |
| SWE-bench Pro | Coming soon | 54.3% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 63.8% | Coming soon |
| FrontierSWE v2 | Coming soon | 4.1% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 85.5% | Coming soon |
| SWE-bench (Vals) | Coming soon | 77.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: 78.8 (Unranked · 3 rankable rows)
- Inkling public-lane score: 79 (#14/29)

| Benchmark | GPT-5.5 Pro | Inkling | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 95.00% | Coming soon | Coming soon |
| ARC-AGI-2 | 84.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: Coming soon
- Inkling public-lane score: 67.5 (#35/54)

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

### Knowledge

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: Coming soon
- Inkling public-lane score: 54.5 (Supported · #62/181)

| Benchmark | GPT-5.5 Pro | Inkling | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.2% | 46% | GPT-5.5 Pro |
| HLE w/o tools | 43.1% | 30% | GPT-5.5 Pro |
| GPQA | Coming soon | 87.9% | Coming soon |
| GPQA-D | Coming soon | 87.9% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 87.1% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 86.3% | Coming soon |

### Instruction Following

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: Coming soon
- Inkling public-lane score: 87.6 (#35/128)

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

### Mathematics

- Winner: Not comparable
- GPT-5.5 Pro public-lane score: 94 (Unranked · 3 rankable rows)
- Inkling public-lane score: 58.3 (#11/12)

| Benchmark | GPT-5.5 Pro | Inkling | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 52.4% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 87.719% | 33.333% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 78.049% | 4.878% | GPT-5.5 Pro |
| AIME26 | Coming soon | 97.1% | Coming soon |

## FAQ

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

GPT-5.5 Pro has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

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

The widest category gap is in mathematics, where the averages are 94 for GPT-5.5 Pro and 58.3 for Inkling.

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

GPT-5.5 Pro currently has 8 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 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Inkling vs GPT-5.5](/compare/gpt-5-5-vs-inkling)
- [GPT-5.5 Pro vs Inkling-Small](/compare/gpt-5-5-pro-vs-inkling-small)
- [Inkling vs Inkling-Small](/compare/inkling-vs-inkling-small)

## Explore More

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