Gpt 5 Codex

Provider: openrouter · openrouter/openai/gpt-5-codex

Pricing per million tokens

Component USD per 1M tokens
Input $1.25
Output $10.00
Cached input (read) $0.13

💡 With prompt caching, you save up to 90% on cached input tokens — massive for repeated context like system prompts, RAG retrieval, or long conversations.

Monthly cost estimates

Assuming 30% prompt-cache hit rate where available. Adjust for your actual usage.

Small
1M in / 200k out
$2.91
per month
Saves $0.34 via caching
Medium
10M in / 2000k out
$29.13
per month
Saves $3.38 via caching
Large
100M in / 20000k out
$291
per month
Saves $33.75 via caching

Context

Input window
272,000 tokens
Max output
128,000 tokens

Capabilities

  • ⬜ Vision (image input)
  • ⬜ Function / tool calling
  • ⬜ Prompt caching
  • ⬜ Web search
  • ⬜ JSON / response schema

Compare Gpt 5 Codex with similar models

Claude Haiku 4.5
openrouter
$1.00 in / $5.00 out
Gpt 5.2 Codex
openrouter
$1.75 in / $14.00 out
Gpt 5
openrouter
$1.25 in / $10.00 out
Gpt 5.1 Codex Max
openrouter
$1.25 in / $10.00 out
Gpt 5.2
openrouter
$1.75 in / $14.00 out
Glm 5
openrouter
$0.80 in / $2.56 out

Pricing data sourced from LiteLLM and refreshed regularly. Last updated May 20, 2026. Always verify with the provider's official pricing page before making business decisions.