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55 lines
2.5 KiB
Markdown
55 lines
2.5 KiB
Markdown
# anthropic/opus-4-8-coding (Claude Opus 4.8 Advanced Coding)
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This example exercises Claude Opus 4.8 on hard coding tasks using the `xhigh` effort level with adaptive thinking.
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You can run this example with:
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```bash
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npx promptfoo@latest init --example anthropic/opus-4-8-coding
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cd opus-4-8-coding
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```
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## What This Tests
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Claude Opus 4.8 is Anthropic's most capable model for complex reasoning and agentic coding. This example evaluates:
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- **Bug diagnosis** across multiple system boundaries
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- **Production-quality code generation** with proper error handling
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- **Code review** with nuanced, prioritized feedback
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## Working with Opus 4.8
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- **Builds on Opus 4.7.** Opus 4.8 supports the same feature set as 4.7 (no breaking API changes) and improves capability on complex reasoning and long-horizon agentic coding.
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- **Adaptive thinking is opt-in.** Set `thinking: { type: adaptive }` (as this example does) to let the model decide when and how much to reason per request. Without an explicit `thinking` block the model runs **without** extended thinking, even at high effort.
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- **`effort` defaults to `high`; `xhigh` is available.** Setting `effort: high` behaves the same as omitting it. Start with `xhigh` for coding and agentic work, and pair high effort with a large `max_tokens`.
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- **Sampling controls are managed for you.** Opus 4.8 rejects `temperature`, `top_p`, and `top_k` at the model level; promptfoo omits them automatically (don't set them in config).
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## Running the Example
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```bash
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# Set your API key
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export ANTHROPIC_API_KEY=your_api_key_here
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# Run the evaluation
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npx promptfoo@latest eval
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# View results
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npx promptfoo@latest view
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```
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## Other providers
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Opus 4.8 is also reachable through:
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- AWS Bedrock — `bedrock:us.anthropic.claude-opus-4-8` (or `bedrock:converse:us.anthropic.claude-opus-4-8`)
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- Google Vertex — `vertex:claude-opus-4-8` with `config.region: global`
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- Azure AI Foundry — point `anthropic:messages:claude-opus-4-8` at `https://<resource>.services.ai.azure.com/anthropic` via `apiBaseUrl`
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Across all four providers, promptfoo automatically omits the unsupported sampling parameters (`temperature`, `top_p`, `top_k`) for Opus 4.8. The Anthropic Messages provider also logs a one-time warning if you set them explicitly; the Bedrock, Vertex, and Azure paths omit them silently.
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## Learn More
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- [Claude Opus 4.8 announcement](https://www.anthropic.com/news/claude-opus-4-8)
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- [Anthropic documentation](https://docs.anthropic.com)
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- [Promptfoo Anthropic provider docs](https://promptfoo.dev/docs/providers/anthropic)
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