Claude Sonnet 4.6vsGPT-5 Codex
Claude Sonnet 4.6 is the newer model, released after GPT-5 Codex.
| Spec | Claude Sonnet 4.6 | GPT-5 Codex |
|---|---|---|
| Input price | $3/M tokens | — |
| Output price | $15/M tokens | — |
| Context window | 1.0M tokens | — |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Sep 2025 |
| SWE-bench Verified | 79.0% | 74.5% |
Our Verdict
Claude Sonnet 4.6
GPT-5 Codex
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Claude Sonnet 4.6
Input
$3.00
Output
$15.00
GPT-5 Codex
Input
—
Output
—
Where to run it
4 hosts
GPT-5 Codex
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 12 Sep 2026.
Writing DNA
Style Comparison
Similarity
45%
Claude Sonnet 4.6 uses 4.3x more headings
Claude Sonnet 4.6
GPT-5 Codex
56%Vocabulary64%
36wSentence Length17w
0.53Hedging0.38
5.1Bold2.3
3.4Lists3.5
0.19Emoji0.15
2.10Headings0.49
0.02Transitions0.05
Based on 23 + 13 text responses
Research
What we learned reading every model
FAQ
Common questions
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