API pricing per million tokens
- Input
- $1.25
- per 1M, list
- Output
- $10
- per 1M tokens
- Cached input
- $0.125
- batch $0.625 / $5
- Context
- 400K
- 128K max output
Where to buy it (5)
OpenAIflex-50%$0.625 / $5cached $0.063
Azure AI Foundrydefault region$1.25 / $10cached $0.13
Through a gateway
Your own numbers100M input and 20M output tokens a month: $325.00 direct.
Helicone$325.00+0%
Kong AI Gateway$325.00+0%
LiteLLM$325.00+0%
Vercel AI Gateway$325.00+0%
AWS Bedrock$325.00+0%
Google Vertex AI$325.00+0%
Databricks Mosaic AI$325.00+0%
Hugging Face Inference$325.00+0%
Cloudflare AI Gateway$341.25+5%
Requesty$341.25+5%
Eden AI$342.88+5.5%
OpenRouter$342.88+5.5%
Snowflake Cortex AI$390.00+20%
Martian Gatewayn/a
Portkeyn/a
TrueFoundry AI Gatewayn/a
IBM watsonx.ain/a
OCI Generative AIn/a
NVIDIA NIMn/a
Related models
Muse Spark 1.3Meta · 1M$1.25 / $4.25in / out per 1M$1.25$4.25$0.151MSep 2, 2026
Gemini 3.1 Pro PreviewGoogle Gemini API · 1M$2 / $12in / out per 1M$2$12$0.21MFeb 19, 2026
Qwen3.8 Max (0902)Qwen (Alibaba) · 1M$2 / $6in / out per 1M$2$6$0.251MSep 3, 2026
About GPT-5.1
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.
Takes image, text, files in and returns text. First listed Nov 14, 2025. Blended price $3.44 per 1M tokens at 3 input to 1 output. Overall score 3 on leadersboard.fru.dev (rank 39).
Questions
How much does GPT-5.1 cost?
$1.25 per million input tokens and $10 per million output tokens, with cached input at $0.125, or $0.625 and $5 through the Batch API.
What is the context window of GPT-5.1?
400K tokens, with up to 128K tokens of output.
Where is GPT-5.1 cheapest?
Of 5 routes tracked, OpenAI is cheapest at $0.625 input and $5 output per million tokens.
List prices from providers' pages on the date shown; your contract may differ. Logos via logo.dev; trademarks belong to their owners.