fix(tests): update test_max_effort_rejected_for_opus_45 regex to match current error message

[jquinter]

Summary

• test_max_effort_rejected_for_opus_45 was failing because the production error message was expanded when Sonnet 4.6 was added as a supported model for effort='max'
• Old message: "effort='max' is only supported by Claude Opus 4.6"
• New message: "effort='max' is only supported by Claude 4.6 models (Opus 4.6, Sonnet 4.6). Got model: ..."
• Updated the test's match= regex to "effort='max' is only supported by Claude 4.6 models" which matches the current message

Not related to PR #21664 (which only touches pricing JSON files).

Test plan

• test_max_effort_rejected_for_opus_45 passes locally after fix

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
litellm	Building	Preview, Comment	Feb 20, 2026 2:08pm

[greptile-apps]

Greptile Summary

Test-only fix: updates the match regex in test_max_effort_rejected_for_opus_45 from "effort='max' is only supported by Claude Opus 4.6" to "effort='max' is only supported by Claude 4.6 models" to match the current error message in litellm/llms/anthropic/chat/transformation.py:1374, which was expanded when Sonnet 4.6 was added as a supported model for effort='max'.

• Updated pytest.raises match string to align with the current ValueError message format
• No functional or production code changes
• Test remains a pure unit test with no network calls

Confidence Score: 5/5

• This PR is safe to merge — it is a minimal, correct test fix with no production code changes.
• The PR changes a single regex string in one test file to match the current error message in production code. The change is verified correct against the source at transformation.py:1374. No production code is modified, no new tests are introduced, and the existing test logic is unchanged.
• No files require special attention.

Important Files Changed

Filename	Overview
tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_transformation.py	Updated pytest.raises match regex in test_max_effort_rejected_for_opus_45 to align with the expanded error message in transformation.py:1374. The new regex correctly matches the current production error message.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["transform_request called with<br/>model=claude-opus-4-5, effort='max'"] --> B{"Is effort == 'max'?"}
    B -->|Yes| C{"_is_claude_4_6_model(model)?"}
    C -->|No| D["Raise ValueError:<br/>effort='max' is only supported by<br/>Claude 4.6 models (Opus 4.6, Sonnet 4.6)"]
    C -->|Yes| E["Set output_config in request data"]
    B -->|No| E
    D --> F["pytest.raises catches ValueError"]
    F --> G["match regex validates error message:<br/>'effort=max is only supported by Claude 4.6 models'"]

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