Claude 3.5 Sonnet vs GPT-5.2 Codex: Specs & Benchmark Comparison
| Characteristic | Claude 3.5 Sonnet | GPT-5.2 Codex |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | June 21, 2024 | January 13, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 200K | 400K |
| Context (output) | 200K | 128K |
| Input Price / 1M | $3.00 | $1.75 |
| Output Price / 1M | $15.00 | $14.00 |
| Average Score | 0.8 | 0.6 |
Verdict
GPT-5.2 Codex leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude 3.5 Sonnet — 0.8, GPT-5.2 Codex — 0.6.
API Cost
GPT-5.2 Codex is 1.1x cheaper: input $1.75/1M vs $3.00/1M tokens.
Context Window
GPT-5.2 Codex supports a larger context: 400K vs 200K tokens.
Recency
GPT-5.2 Codex is newer: released 1/13/2026 vs 6/21/2024.
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Frequently Asked Questions
Which is better for coding — Claude 3.5 Sonnet or GPT-5.2 Codex?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude 3.5 Sonnet or GPT-5.2 Codex?
GPT-5.2 Codex is cheaper for input: $1.75 per 1M tokens vs $3.00.
Which has a larger context window — Claude 3.5 Sonnet or GPT-5.2 Codex?
GPT-5.2 Codex supports a larger context: 400,000 tokens vs 200,000.
The Claude 3.5 Sonnet and GPT-5.2 Codex comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude 3.5 Sonnet or GPT-5.2 Codex page. See also the complete list of AI model comparisons.