token.app › Compare › GPT-5.1-Codex-Mini vs Claude Opus 5

GPT-5.1-Codex-Mini vs Claude Opus 5

GPT-5.1-Codex-Mini is 15× 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-5.1-Codex-MiniClaude Opus 5
ProviderOpenAIAnthropic
Input $/1M$0.250$5.00
Output $/1M$2.00$25.00
Blended $/1M$0.688$10.00
Context window400K1M
Max output128K128K
ReleasedNov 2025Jul 2026
LicenceProprietaryProprietary
Choose GPT-5.1-Codex-Mini if…
  • Costs less per token — $0.688 vs $10.00 blended
Choose Claude Opus 5 if…
  • Larger context window (1M)
  • Newer model (released Jul 2026)
FAQ
Which is better, GPT-5.1-Codex-Mini or Claude Opus 5?
We do not hold independently-run benchmark scores covering both GPT-5.1-Codex-Mini and Claude Opus 5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is GPT-5.1-Codex-Mini cheaper than Claude Opus 5?
GPT-5.1-Codex-Mini is cheaper: $0.688 versus $10.00 per million tokens blended at 3:1 input:output. Input alone: $0.250 vs $5.00. Output alone: $2.00 vs $25.00.
What context windows do GPT-5.1-Codex-Mini and Claude Opus 5 have?
GPT-5.1-Codex-Mini: 400,000 tokens. Claude Opus 5: 1,000,000 tokens.
Who makes GPT-5.1-Codex-Mini and Claude Opus 5?
GPT-5.1-Codex-Mini is made by OpenAI. Claude Opus 5 is made by Anthropic.
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