# GPT-5.1 Chat

> GPT-5.1 Chat is the chat-tuned variant of GPT-5.1, optimised for back-and-forth conversation and instruction following. It supports a 128,000-token input context, accepts text and image inputs, and exposes streaming, function calling, and structured outputs.


**ID**: `openai/gpt-5.1-chat`  
**Creator**: OpenAI  
**Category**: multimodal  
**Context**: 128K tokens  
**Status**: Disabled (since 2026-08-13) — no longer routable or listed; kept for history/usage reference.  
**Reason**: Cloudflare Workers AI retired this SKU; the binding returns HTTP 410 (Gone) on every attempt. In the same 2026-07-25 smoke run, the sibling partner-hosted model openai/gpt-5.6-luna reached the same OpenAI-on-Workers-AI rail and got HTTP 400 (request rejected, not gone), showing the retirement is specific to this SKU rather than a rail-wide outage or billing issue. It was this model's only upstream, so it was disabled rather than the route pruned.  
**Input**: $1.25/M  
**Output**: $10.00/M  
**Released**: 2025-11-13  
**Web page**: https://anyrouter.dev/model/openai/gpt-5.1-chat

**Input modalities**: text, image  
**Output modalities**: text  

**Tokenizer**: GPT

**Capabilities**: chat, coding, reasoning, streaming, function-calling, vision

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5.1-chat",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| Cloudflare AI Workers | $1.25/M | $10.00/M |

## Source

- Upstream docs: https://developers.cloudflare.com/ai/models/openai/gpt-5.1-chat/