# Claude Opus 4.6 (Adaptive) vs GPT-5.1-Codex-Max

> Side-by-side benchmark comparison for Claude Opus 4.6 (Adaptive) and GPT-5.1-Codex-Max across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-6-thinking-vs-gpt-5-1-codex-max
- 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: Claude Opus 4.6 (Adaptive) and GPT-5.1-Codex-Max 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.
- Claude Opus 4.6 (Adaptive) has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Opus 4.6 (Adaptive) | GPT-5.1-Codex-Max |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 400K |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 1 | 2 |
| Pricing (input/output) | N/A | $1.25 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: 46.9 (Estimated · #42/117)
- GPT-5.1-Codex-Max public-lane score: Coming soon

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: 54.2 (Estimated · #33/143)
- GPT-5.1-Codex-Max public-lane score: Coming soon

| Benchmark | Claude Opus 4.6 (Adaptive) | GPT-5.1-Codex-Max | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 53.50% | 22.17% | Claude Opus 4.6 (Adaptive) |
| LiveCodeBench (Vals) | Coming soon | 83.6% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Opus 4.6 (Adaptive) and GPT-5.1-Codex-Max?

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

- [Claude Opus 4.6 (Adaptive) vs Claude Opus 4.6](/compare/claude-opus-4-6-vs-claude-opus-4-6-thinking)
- [GPT-5.1-Codex-Max vs Claude Opus 4.6](/compare/claude-opus-4-6-vs-gpt-5-1-codex-max)
- [Claude Opus 4.6 (Adaptive) vs GPT-6 Astra](/compare/claude-opus-4-6-thinking-vs-gpt-6-astra)
- [GPT-5.1-Codex-Max vs GPT-6 Astra](/compare/gpt-5-1-codex-max-vs-gpt-6-astra)

## Explore More

- [Claude Opus 4.6 (Adaptive) profile](/models/claude-opus-4-6-thinking)
- [GPT-5.1-Codex-Max profile](/models/gpt-5-1-codex-max)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)