Pricingby GlyphGPT-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.
Ways to buy 5
| Way to buy | Input | Output | In / out per 1M | Cached | Vs list |
|---|---|---|---|---|---|
flex, cheapest · cached $0.063 | $0.625 | $5 | $0.625 / $5-50% vs list | $0.063 | -50% vs list |
The lab's own API · cached $0.125 | $1.25 | $10 | $1.25 / $10List price | $0.125 | List price |
Default region · cached $0.13 | $1.25 | $10 | $1.25 / $10Same as list | $0.13 | Same as list |
swedencentral · cached $0.143 | $1.38 | $11 | $1.38 / $11+10% vs list | $0.143 | +10% vs list |
fast · cached $0.25 | $2.5 | $20 | $2.5 / $20+100% vs list | $0.25 | +100% vs list |
USD per 1M tokens; batch $0.625 in, $5 out on the lab's API. Regions are separate routes.
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%
Neon AI Gateway$325.00+0%
Cloudflare AI Gateway$341.25+5%
Requesty$341.25+5%
Eden AI$342.88+5.5%
OpenRouter$342.88+5.5%
Vercel AI GatewayNot offeredNot offered
A dash: not on that gateway's own model list. No published token fee: Martian Gateway, Portkey, TrueFoundry AI Gateway.
Related models
| In / out per 1M | Cheapest route | |||||||
|---|---|---|---|---|---|---|---|---|
OpenAI · 1.05MCheapest: $1 on OpenAI (flex) | $1 | $5 | $1 / $5 | $2 | 1.05M | $1 on OpenAI (flex) | · | GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol. |
OpenAI · 1.05MCheapest: $1 on OpenAI (flex) | $1 | $5 | $1 / $5 | $2 | 1.05M | $1 on OpenAI (flex) | · | GPT-6.1 Terra Pro is the same underlying model as GPT-6.1 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks. |
OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · | GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. |
OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · | GPT-6.1 Sol Pro is the same underlying model as GPT-6.1 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks. |
Google · 1MCheapest: $2 on Google Gemini API (flex) | $2 | $10 | $2 / $10 | $4 | 1M | $2 on Google Gemini API (flex) | · | Gemini 4 Argon is Google's flagship reasoning model, built for complex software engineering, deep mathematical and scientific problem solving, and autonomous multi-step agents. |
Anthropic · 1M | $2 | $10 | $2 / $10 | $4 | 1M | Lab list price | · | Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. |
Meta · 1M | $1.25 | $4.25 | $1.25 / $4.25 | $2 | 1M | Lab list price | · | Muse Spark 1.1 is a multimodal reasoning model from Meta, built for agentic tasks. |
Qwen (Alibaba) · 1M | $2 | $6 | $2 / $6 | $3 | 1M | Lab list price | · | Qwen3.8 Max 0902 is an updated snapshot of Qwen3.8 Max from Alibaba's Qwen team. |
About GPT-5.1
Takes image, text, files in and returns text. First listed Nov 14, 2025. Up to 128K output tokens. Blended price $3.44 per 1M tokens at 3 input to 1 output. Model id gpt-5-1.
Price history
List price since Nov 14, 2025, from Internet Archive snapshots of the OpenRouter catalog, then daily reads.
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.