Is OpenAI: GPT-5.1 Codex or Anthropic: Claude Opus 4.1 cheaper?

OpenAI: GPT-5.1 Codex is cheaper on output tokens ($10.00 vs $75.00 per 1M).

Which has the larger context window, OpenAI: GPT-5.1 Codex or Anthropic: Claude Opus 4.1?

OpenAI: GPT-5.1 Codex has the larger context window (400K tokens).

OpenAI: GPT-5.1 Codex vs Anthropic: Claude Opus 4.1

OpenAI: GPT-5.1 Codex is cheaper on output tokens, while OpenAI: GPT-5.1 Codex offers a larger context window. Choose OpenAI: GPT-5.1 Codex or Anthropic: Claude Opus 4.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	OpenAI: GPT-5.1 Codex	Anthropic: Claude Opus 4.1
Provider	Helicone	Helicone
Input / 1M tokens	$1.25	$15.00
Output / 1M tokens	$10.00	$75.00
Context window	400K	200K
Parameters	—	—
Open weights	No	No
Released	Jan 2025	Aug 2025

OpenAI: GPT-5.1 Codex details →Anthropic: Claude Opus 4.1 details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.