Home / All model prices / OpenAI / gpt-5-1 O OpenAI
gpt-5-1 OpenRouter price Model overview GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
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 image text file include reasoning max completion tokens max 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
