# Claude Opus 5 Fast

> Fast-mode variant of Claude Opus 5 with the same capabilities and a 1,000,000-token context window, tuned for higher output speed.

**ID**: `anthropic/claude-opus-5-fast`  
**Creator**: Anthropic  
**Category**: text  
**Context**: 1M tokens  
**Pricing**: $10.00 / $50.00 per 1M · billed by your provider (BYOK)  
**Released**: 2026-07-24  
**Web page**: https://anyrouter.dev/model/anthropic/claude-opus-5-fast

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

**Tokenizer**: Claude

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

**Supported parameters**: max_tokens, temperature, top_p, stop, tools, tool_choice, response_format, reasoning, include_reasoning, structured_outputs

## 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": "anthropic/claude-opus-5-fast",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| openrouter-byok | $10.00/M (list) | $50.00/M (list) |
| vercel-byok | $10.00/M (list) | $50.00/M (list) |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Source

- Upstream docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode