# Claude Opus 4.6 (Adaptive) vs GPT-5.2-Codex

> Side-by-side benchmark comparison for Claude Opus 4.6 (Adaptive) and GPT-5.2-Codex across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-6-thinking-vs-gpt-5-2-codex
- 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-5.2-Codex 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-5.2-Codex |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 400K |
| Independent public score (not head-to-head) | null | 49.86 |
| Benchmarks Covered | 1 | 5 |
| Pricing (input/output) | N/A | $1.75 / $14.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: 46.9 (Estimated · #42/117)
- GPT-5.2-Codex public-lane score: 34.6 (Estimated · #68/117)

| Benchmark | Claude Opus 4.6 (Adaptive) | GPT-5.2-Codex | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | Coming soon | 51.79% | Coming soon |
| JobBench | Coming soon | 26.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: 54.2 (Estimated · #33/143)
- GPT-5.2-Codex public-lane score: 45.2 (Supported · #52/143)

| Benchmark | Claude Opus 4.6 (Adaptive) | GPT-5.2-Codex | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 53.50% | 37.91% | Claude Opus 4.6 (Adaptive) |
| LiveCodeBench (Vals) | Coming soon | 88.0% | Coming soon |
| SWE-bench (Vals) | Coming soon | 72.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: Coming soon
- GPT-5.2-Codex public-lane score: 78.9 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: Coming soon
- GPT-5.2-Codex public-lane score: 73.5 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: Coming soon
- GPT-5.2-Codex public-lane score: 51.8 (Estimated · #60/169)

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Opus 4.6 (Adaptive) public-lane score: Coming soon
- GPT-5.2-Codex public-lane score: 92.4 (#3/124)

## FAQ

### Is there enough evidence to pick between Claude Opus 4.6 (Adaptive) and GPT-5.2-Codex?

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-5.2-Codex vs Claude Opus 4.6](/compare/claude-opus-4-6-vs-gpt-5-2-codex)
- [Claude Opus 4.6 (Adaptive) vs GPT-6 Astra](/compare/claude-opus-4-6-thinking-vs-gpt-6-astra)
- [GPT-5.2-Codex vs GPT-6 Astra](/compare/gpt-5-2-codex-vs-gpt-6-astra)

## Explore More

- [Claude Opus 4.6 (Adaptive) profile](/models/claude-opus-4-6-thinking)
- [GPT-5.2-Codex profile](/models/gpt-5-2-codex)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)