mirror of
https://github.com/anthropics/claude-code.git
synced 2026-05-10 17:32:40 +00:00
52817e8c22
Addresses issue where Opus fast model was limited to 200k tokens instead of supporting extended context length. Changes: - Add OPUS_FAST_CONFIGURATION.md with environment variable setup - Add FAST_MODEL_CONFIG.md in migration plugin for fast deployment - Update migration guide to include fast model strings and configuration - Provide VSCode configuration options for fast model usage The fast deployment supports >200k tokens and resolves the error: "prompt is too long: 282789 tokens > 200000 maximum" Configuration: Set ANTHROPIC_DEFAULT_OPUS_MODEL="claude-opus-4-5-20251101-fast"
70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
# Fast Opus 4.5 Model Configuration
|
|
|
|
## Issue
|
|
The standard Opus 4.5 configuration is limited to 200,000 tokens, causing failures with larger contexts.
|
|
|
|
## Solution: Fast Opus Deployment
|
|
|
|
### Environment Variable Configuration
|
|
|
|
To use the fast Opus deployment with extended context length, configure Claude Code with:
|
|
|
|
```bash
|
|
# Set the Opus alias to use the fast deployment
|
|
export ANTHROPIC_DEFAULT_OPUS_MODEL="claude-opus-4-5-20251101-fast"
|
|
```
|
|
|
|
### Model String Updates for Fast Deployment
|
|
|
|
| Platform | Fast Opus 4.5 Model String |
|
|
|----------|---------------------------|
|
|
| Anthropic API (1P) | `claude-opus-4-5-20251101-fast` |
|
|
| AWS Bedrock | `anthropic.claude-opus-4-5-20251101-fast-v1:0` |
|
|
| Google Vertex AI | `claude-opus-4-5-fast@20251101` |
|
|
| Azure AI Foundry | `claude-opus-4-5-20251101-fast` |
|
|
|
|
### Context Length Configuration
|
|
|
|
The fast deployment supports extended context. Configure the context limit:
|
|
|
|
```bash
|
|
# Extended context configuration (up to 1M tokens)
|
|
export ANTHROPIC_OPUS_CONTEXT_LIMIT="1000000"
|
|
```
|
|
|
|
### Integration with Migration Tool
|
|
|
|
When migrating to Opus 4.5 with extended context requirements:
|
|
|
|
1. Use the fast model strings above instead of standard ones
|
|
2. Set the environment variable for Opus alias
|
|
3. Configure extended context limit
|
|
4. Test with large contexts (>200k tokens)
|
|
|
|
### VSCode Configuration
|
|
|
|
For VSCode extension users:
|
|
|
|
```json
|
|
{
|
|
"claude-code.environmentVariables": {
|
|
"ANTHROPIC_DEFAULT_OPUS_MODEL": "claude-opus-4-5-20251101-fast",
|
|
"ANTHROPIC_OPUS_CONTEXT_LIMIT": "1000000"
|
|
}
|
|
}
|
|
```
|
|
|
|
### Verification
|
|
|
|
Test the configuration with a prompt that exceeds 200k tokens to ensure the error:
|
|
```
|
|
prompt is too long: 282789 tokens > 200000 maximum
|
|
```
|
|
is resolved.
|
|
|
|
## When to Use Fast vs Standard
|
|
|
|
- **Use Fast**: For large codebases, extensive context analysis, long conversations
|
|
- **Use Standard**: For typical development tasks with smaller context requirements
|
|
|
|
The fast deployment trades some response speed for much higher context capacity. |