# Gemini 4 Carbon vs GPT-5.5

> Side-by-side benchmark comparison for Gemini 4 Carbon and GPT-5.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-4-carbon-vs-gpt-5-5
- Last updated: October 28, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 4 Carbon and GPT-5.5 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Gemini 4 Carbon has the lower published output-token price.
- GPT-5.5 has the larger published context window at 1M.

## Model Snapshot

| Property | Gemini 4 Carbon | GPT-5.5 |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | null | 1M |
| Independent public score (not head-to-head) | 88.42 | 68.83 |
| Benchmarks Covered | 9 | 45 |
| Pricing (input/output) | $2.00 / $10.00 | $5.00 / $30.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: Coming soon
- GPT-5.5 public-lane score: 61 (Supported · #25/134)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| AutomationBench | 53.9% | Coming soon | Coming soon |
| OSWorld 2.1 Offline | 81.5% | Coming soon | Coming soon |
| CWE-bench v1 | 71.0% | Coming soon | Coming soon |
| ExploitGym | 53.5% | 13.4% | Gemini 4 Carbon |
| Terminal-Bench 2.0 | Coming soon | 82% | Coming soon |
| CyberGym | Coming soon | 81.8% | Coming soon |
| BrowseComp | Coming soon | 84.4% | Coming soon |
| OSWorld-Verified | Coming soon | 78.7% | Coming soon |
| MCP Atlas | Coming soon | 75.3% | Coming soon |
| Toolathlon | Coming soon | 55.6% | Coming soon |
| τ²-bench results | Coming soon | 98% | Coming soon |
| Gert Labs | Coming soon | 72.93% | Coming soon |
| ResearchClawBench | Coming soon | 17.0% | Coming soon |
| OSWorld 2.0 | Coming soon | 13.0% | Coming soon |
| JobBench | Coming soon | 42.7% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 76.4% | Coming soon |
| ApprenticeBench | Coming soon | 20% | Coming soon |
| MazeBench | Coming soon | 0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: 82.2 (Supported · #3/156)
- GPT-5.5 public-lane score: 62.4 (Supported · #15/156)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierSWE v2 | 61.2% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 58.6% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 82.0% | Coming soon |
| Vibe Code Bench | Coming soon | 69.85% | Coming soon |
| React Native Evals | Coming soon | 84.7% | Coming soon |
| cursorBench31 | Coming soon | 59.2% | Coming soon |
| CursorBench 3.2 | Coming soon | 58.4% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 43.0% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 85.3% | Coming soon |
| SWE-bench (Vals) | Coming soon | 82.6% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 27.2% | Coming soon |
| FrontierCode 2.0 | Coming soon | 22.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: 79.5 (Unranked · 2 rankable rows)
- GPT-5.5 public-lane score: 69.7 (#17/26)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| GraphWalks BFS 256K–1M | 96.2% | Coming soon | Coming soon |
| MRCR v2 64K-128K | Coming soon | 83.1% | Coming soon |
| MRCR v2 128K-256K | Coming soon | 87.5% | Coming soon |
| ARC-AGI-2 | Coming soon | 85% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.4% | Coming soon |
| ARC-AGI-1 | Coming soon | 95.00% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: Coming soon
- GPT-5.5 public-lane score: 74.4 (#28/58)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 72.5% | Coming soon | Coming soon |
| Blueprint-Bench 2 | 58.6% | Coming soon | Coming soon |
| ExtractBench (LlamaIndex) | Coming soon | 93.57% | Coming soon |
| ParseBench | Coming soon | 66.63% | Coming soon |
| MMMU-Pro | Coming soon | 81.2% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 83.2% | Coming soon |
| OfficeQA Pro | Coming soon | 54.1% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: 88.2 (Supported · #2/178)
- GPT-5.5 public-lane score: 71.2 (Supported · #14/178)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 93.6% | Coming soon |
| GPQA-D | Coming soon | 93.6% | Coming soon |
| HLE | Coming soon | 52.2% | Coming soon |
| HLE w/o tools | Coming soon | 41.4% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 93.2% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 88.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: Coming soon
- GPT-5.5 public-lane score: 93.3 (#9/157)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 0.0% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 4 Carbon public-lane score: Coming soon
- GPT-5.5 public-lane score: 91.2 (Unranked · 3 rankable rows)

| Benchmark | Gemini 4 Carbon | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 51.7% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 85.263% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 72.500% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 4 Carbon and GPT-5.5?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Gemini 4 Carbon vs Gemini 4 Argon](/compare/gemini-4-argon-vs-gemini-4-carbon)
- [GPT-5.5 vs Gemini 4 Argon](/compare/gemini-4-argon-vs-gpt-5-5)
- [Gemini 4 Carbon vs GPT-5.5 Pro](/compare/gemini-4-carbon-vs-gpt-5-5-pro)
- [GPT-5.5 vs GPT-5.5 Pro](/compare/gpt-5-5-vs-gpt-5-5-pro)

## Explore More

- [Gemini 4 Carbon profile](/models/gemini-4-carbon)
- [GPT-5.5 profile](/models/gpt-5-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)