token.app › Compare › GPT-5.3-Codex vs Claude Opus 5
GPT-5.3-Codex vs Claude Opus 5
GPT-5.3-Codex is 2.1× cheaper per token on a blended 3:1 basis. Claude Opus 5 accepts the larger context window (1M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5.3-Codex | Claude Opus 5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input $/1M | $1.75 | $5.00 |
| Output $/1M | $14.00 | $25.00 |
| Blended $/1M | $4.81 | $10.00 |
| Context window | 400K | 1M |
| Max output | 128K | 128K |
| Released | Feb 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
Choose GPT-5.3-Codex if…
- Costs less per token — $4.81 vs $10.00 blended
Choose Claude Opus 5 if…
- Larger context window (1M)
- Newer model (released Jul 2026)
FAQ
Which is better, GPT-5.3-Codex or Claude Opus 5?
We do not hold independently-run benchmark scores covering both GPT-5.3-Codex and Claude Opus 5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is GPT-5.3-Codex cheaper than Claude Opus 5?
GPT-5.3-Codex is cheaper: $4.81 versus $10.00 per million tokens blended at 3:1 input:output. Input alone: $1.75 vs $5.00. Output alone: $14.00 vs $25.00.
What context windows do GPT-5.3-Codex and Claude Opus 5 have?
GPT-5.3-Codex: 400,000 tokens. Claude Opus 5: 1,000,000 tokens.
Who makes GPT-5.3-Codex and Claude Opus 5?
GPT-5.3-Codex is made by OpenAI. Claude Opus 5 is made by Anthropic.