GPT-5.1 Chat
GPT-5.1 Chat is OpenAI's language model with a 128K context window and up to 16K output tokens, available from 3 providers, starting at $1.25 / 1M input and $10.00 / 1M output. A GPT-5.1 variant tracking the snapshot used in ChatGPT, optimized for conversational use cases and chat-oriented improvements.
OpenAI's language model with a 128K context window and up to 16K output tokens, available from 3 providers, starting at $1.25 / 1M input and $10.00 / 1M output. A GPT-5.1 variant tracking the snapshot used in ChatGPT, optimized for conversational use cases and chat-oriented improvements.Capabilities
Input3/5
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Output1/5
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Capabilities7/13
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Pricing by Provider
| Provider | Standard | ||
|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | |
OpenAI | $1.25 | $10.00 | $0.125 |
 OpenRouter | $1.25 | $10.00 | $0.125 |
 Azure AI Foundry | $1.38 | $11.00 | $0.140 |
Regional pricing
Provider-specific pricing that varies by region.
Azure AI Foundry
25 regions
| Region | Standard | ||
|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | |
| Global | |||
| Global | $1.38 | $11.00 | $0.140 |
| Africa | |||
| South Africa North (Johannesburg)/ southafricanorth | $1.25 | — | $0.125 |
| Asia Pacific | |||
| Australia East (New South Wales)/ australiaeast | $1.25 | — | $0.125 |
| Japan East (Tokyo, Saitama)/ japaneast | $1.25 | — | $0.125 |
| Korea Central (Seoul)/ koreacentral | $1.25 | — | $0.125 |
| South India (Chennai)/ southindia | $1.25 | — | $0.125 |
| Canada | |||
| Canada East (Quebec)/ canadaeast | $1.25 | — | $0.125 |
| Europe | |||
| France Central (Paris)/ francecentral | $1.25 | — | $0.138 |
| Germany West Central (Frankfurt)/ germanywestcentral | $1.25 | — | $0.138 |
| Norway East (Norway)/ norwayeast | $1.25 | — | $0.125 |
| Poland Central (Warsaw)/ polandcentral | $1.38 | — | $0.138 |
| Spain Central (Madrid)/ spaincentral | $1.38 | — | $0.138 |
| Sweden Central (Gävle)/ swedencentral | $1.38 | — | $0.138 |
| Switzerland North (Zurich)/ switzerlandnorth | $1.25 | — | $0.125 |
| UK South (London)/ uksouth | $1.25 | — | $0.125 |
| West Europe (Netherlands)/ westeurope | $1.25 | — | $0.138 |
| Middle East | |||
| UAE North (Dubai)/ uaenorth | $1.25 | — | $0.125 |
| South America | |||
| Brazil South (Sao Paulo State)/ brazilsouth | $1.25 | — | $0.125 |
| US | |||
| Central US (Iowa)/ centralus | $1.25 | — | $0.138 |
| East US (Virginia)/ eastus | $1.38 | — | $0.138 |
| East US 2 (Virginia)/ eastus2 | $1.25 | — | $0.125 |
| North Central US (Illinois)/ northcentralus | $1.25 | — | $0.138 |
| South Central US (Texas)/ southcentralus | $1.38 | — | $0.125 |
| West US (California)/ westus | $1.25 | — | $0.125 |
| West US 3 (Phoenix)/ westus3 | $1.38 | — | $0.138 |
Cost Calculator
Preset:
Compares every provider & tier in USD
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| GPT-5.4 Mini | 1.1M | $0.750 | $4.50 | Available | |
| GPT-5.4 Nano | 1.1M | $0.200 | $1.25 | Available | |
| GPT-5.4 | 1.1M | $2.50 | $15.00 | Available | |
| GPT-5.4 Pro | 1.1M | $30.00 | $180.00 | Available | |
| GPT-5.4 3.5 | — | 1.1M | — | — | Available |
| GPT-5.4 Pro 3.5 | — | 1.1M | — | — | Available |
| GPT-5.3 Chat | 128K | $1.75 | $14.00 | Available | |
| GPT-5.3 Codex | 400K | $1.75 | $14.00 | Available | |
| GPT-5.3 Codex Spark | — | 128K | — | — | Available |
| GPT-5.3 Instant | — | 128K | — | — | Available |
| GPT-5.1 Chat | 128K | $1.25 | $10.00 | Current |