# GPT-5.1 vs o1

> Side-by-side benchmark comparison for GPT-5.1 and o1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-1-vs-o1
- Last updated: September 29, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.1 and o1 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.
- GPT-5.1 has the lower published output-token price.

## Model Snapshot

| Property | GPT-5.1 | o1 |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 200K |
| Independent public score (not head-to-head) | 58.17 | 37.48 |
| Benchmarks Covered | 4 | 4 |
| Pricing (input/output) | $1.25 / $10.00 | $15.00 / $60.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: Coming soon
- o1 public-lane score: Coming soon

| Benchmark | GPT-5.1 | o1 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 41.24% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: 38.9 (Supported · #65/143)
- o1 public-lane score: 30.4 (Estimated · #93/143)

| Benchmark | GPT-5.1 | o1 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 24.61% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: 77.3 (Unranked · 2 rankable rows)
- o1 public-lane score: 67 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: 72.3 (Unranked · 1 rankable row)
- o1 public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: 52 (Estimated · #59/169)
- o1 public-lane score: 40.7 (Supported · #96/169)

| Benchmark | GPT-5.1 | o1 | Winner |
|-----------|-----------|-----------|--------|
| MMLU | Coming soon | 91.8% | Coming soon |
| GPQA | Coming soon | 75.7% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: 87.9 (#27/124)
- o1 public-lane score: 84.5 (#40/124)

| Benchmark | GPT-5.1 | o1 | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 92.2% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.1 public-lane score: 49 (Unranked · 2 rankable rows)
- o1 public-lane score: 32.5 (Unranked · 1 rankable row)

| Benchmark | GPT-5.1 | o1 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 31.034% | 9.310% | GPT-5.1 |
| FrontierMath v2 (Tier 4) | 12.500% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-5.1 and o1?

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

- [GPT-5.1 vs o1-preview](/compare/gpt-5-1-vs-o1-preview)
- [o1 vs o1-preview](/compare/o1-vs-o1-preview)
- [GPT-5.1 vs o1-pro](/compare/gpt-5-1-vs-o1-pro)
- [o1 vs o1-pro](/compare/o1-vs-o1-pro)

## Explore More

- [GPT-5.1 profile](/models/gpt-5-1)
- [o1 profile](/models/o1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)