fix: add adaptive thinking support for Claude Opus 4.7+

[msukkari]

Summary

Fixes the issue where Claude Opus 4.7 returns an error: "thinking.type.enabled" is not supported for this model. Use "thinking.type.adaptive" and "output_config.effort" to control thinking behavior.

Claude Opus 4.7 only supports adaptive thinking mode (thinking.type: 'adaptive') and rejects the legacy budget-based thinking configuration (thinking.type: 'enabled' with budgetTokens).

Changes

Model Detection Logic

Added intelligent model detection to automatically select the appropriate thinking mode:

• Claude Opus 4.7+: Uses adaptive thinking (the only supported mode)
• Claude Opus 4.6 / Sonnet 4.6: Uses adaptive thinking (recommended, though both modes are still supported)
• Older models (Sonnet 4.5, Opus 4.5, etc.): Falls back to budget-based thinking

Provider Support

Extended thinking configuration to all Anthropic-compatible providers:

• anthropic - Direct Anthropic API
• google-vertex-anthropic - Claude on Google Vertex AI
• amazon-bedrock - Claude on AWS Bedrock (automatically detects Anthropic models)

New Environment Variable

Added ANTHROPIC_EFFORT to control thinking depth for models using adaptive thinking:

• low - Minimal thinking, fastest response
• medium - Balanced thinking
• high (default) - Deep thinking
• max - Maximum thinking capability

The existing ANTHROPIC_THINKING_BUDGET_TOKENS is still used for older models that require budget-based thinking.

Backwards Compatibility

This change is fully backwards compatible:

• Older models continue to use budget-based thinking with ANTHROPIC_THINKING_BUDGET_TOKENS
• No changes to the configuration schema or user-facing API
• Default behavior (high effort) matches the previous intelligent behavior

Testing

• All existing tests pass
• Linter passes with no new warnings

Fixes #SOU-918

Linear Issue: SOU-918

  

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