Home / All model prices / OpenAI / gpt-5-1-codex-max O OpenAI
gpt-5-1-codex-max OpenRouter price Model overview GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Context window 400,000 tokens
Knowledge cutoff —
Price last verified 2026-09-06
First observed 2026-08-11 Descriptions, capabilities, and tariffs come from the linked source. First-party prices take priority; OpenRouter fallbacks are labelled.
Current price Estimated API value in USD per million tokens, backed by OpenRouter's public Models API.
Input $1.25
Cached input $0.125
Cache write 5m —
Cache write 1h —
Output $10 Capabilities and formats text image include reasoning max completion tokens reasoning reasoning effort response format seed structured outputs tool choice tools Performance references No comparable benchmark data is currently available.
PRICE EVOLUTION Price history Original observation and every later change, including any change of price source.
Original observed price Official price unavailable 2026-08-11
Input: — Cached input: — Cache write 5m: — Cache write 1h: — Output: —
Price change OpenRouter price 2026-08-20
Input: $1.25 Cached input: $0.125 Cache write 5m: — Cache write 1h: — Output: $10
