Claude Opus 4.8 vs GPT-5.3-Codex
GPT-5.3-Codex leads in 2 of 8 categories
Arena ELO
Tie
Cheaper
GPT-5.3-Codex
Faster
Tie
Detailed Comparison
| Category | Claude Opus 4.8 | GPT-5.3-Codex |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context Window | 200K WIN | 128K |
| Input Price ($/1M) | $15 | $1.75 WIN |
| Output Price ($/1M) | $75 | $14 WIN |
| Arena ELO | N/A | N/A |
| Coding | N/A | N/A |
| Reasoning | N/A | N/A |
| Speed (tokens/sec) | N/A | N/A |
| Open Source | No | No |
Frequently Asked Questions
Which is cheaper, Claude Opus 4.8 or GPT-5.3-Codex?
GPT-5.3-Codex is approximately 83% cheaper than Claude Opus 4.8 per million tokens.
Which has a larger context window?
Claude Opus 4.8 supports 200K context, while GPT-5.3-Codex supports 128K.
Is Claude Opus 4.8 or GPT-5.3-Codex open source?
Claude Opus 4.8 is proprietary. GPT-5.3-Codex is proprietary.
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