fix(anthropic): update deprecated default model and fix temperature/topP conflict

[guoyangzhen]

Problem

Two issues (#392):

1. Deprecated default model: claude-3-5-sonnet-20240620 was deprecated on Oct 28, 2025
2. temperature + topP conflict: Default config passes both temperature and topP, but newer Anthropic models reject requests with both parameters set

Fix

Model update

• Default → claude-sonnet-4-20250514 (Claude 4 Sonnet)
• Added ANTHROPIC_MODEL_ID_CLAUDE_SONNET_4 constant (Python + TypeScript)
• Old CLAUDE_3_5 constant kept for backward compatibility

temperature/topP conflict

• Removed topP from default config
• Made top_p conditional in all API calls — only passed when explicitly set by user
• Users can still set topP: 0.9 via inferenceConfig if their model supports it

Files changed (6)

• python/.../agents/anthropic_agent.py — default model + conditional topP
• python/.../classifiers/anthropic_classifier.py — same
• python/.../types/types.py — new constant
• typescript/.../agents/anthropicAgent.ts — same (Python fixes mirrored)
• typescript/.../classifiers/anthropicClassifier.ts — same
• typescript/.../types/index.ts — new constant

Testing

# Before: fails with deprecated model or temperature+topP error
agent = AnthropicAgent(AnthropicAgentOptions(api_key="..."))

# After: works with Claude 4 Sonnet, temperature only
agent = AnthropicAgent(AnthropicAgentOptions(api_key="..."))

# Users who need topP can still set it:
agent = AnthropicAgent(AnthropicAgentOptions(
    api_key="...",
    inference_config={"topP": 0.9}  # omit temperature
))

Closes #392

[ehsaan-entertainer]

Any update on merge ?

[cornelcroi]

Hey @guoyangzhen, two things must be fixed before this can merge. There is a stray `});` syntax error in `anthropicAgent.ts` — the file will not compile. In `anthropic_classifier.py`, the old constant `ANTHROPIC_MODEL_ID_CLAUDE_3_5_SONNET` is removed instead of kept alongside the new one — any user importing it will break. The new constant should be added while keeping the old one, the same way it is done correctly in `types/types.py`. CI has not run.

Changing the default model is not an API break but it is a silent behavior change for users who do not pin `modelId` — worth a note in the changelog.