claude-opus-4-5-migration

Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. Use when the user wants to update their codebase, prompts, or API calls to use Opus 4.5. Handles model string updates and prompt adjustments for known Opus 4.5 behavioral differences. Does NOT migrate Haiku 4.5.

1.75x

Quality

93%

Does it follow best practices?

Impact

91%

1.75x

Average score across 6 eval scenarios

Securityby

Passed

No known issues

Evaluation results

96%

65%

Upgrade Claude Model in Production API Client

Model string migration with effort parameter and beta header handling

Criteria

Without context

With context

Correct Opus 4.5 model string

66%

Haiku model unchanged

100%

Context beta header removed

100%

Context beta comment added

100%

Effort beta flag added

100%

Effort value is high

100%

output_config structure

100%

No unasked prompt changes

100%

Changes summarized

100%

Follow-up offer

100%

97%

53%

Upgrade AI Assistant to Latest Opus Model on AWS Bedrock

AWS Bedrock platform-specific model string migration

Criteria

Without context

With context

Correct Bedrock Opus 4.5 string

100%

Sonnet 4.5 Bedrock string replaced

50%

100%

Haiku model unchanged

100%

Effort beta flag added

70%

Effort value is high

100%

output_config structure correct

100%

No unsolicited prompt changes

100%

Changes summarized

100%

Follow-up offer

100%

All source files updated

100%

82%

Fix AI Agent Over-Calling Tools After Model Upgrade

Conditional prompt adjustment and XML tag integration

Criteria

Without context

With context

CRITICAL softened in tool context

100%

MUST softened in tool context

100%

ALWAYS softened in tool context

100%

Non-tool emphasis preserved

100%

XML tag used for snippet

Snippet placed logically

100%

No over-engineering snippet added

100%

No thinking snippet added

100%

Changes summarized

100%

Follow-up offer

Model string updated

100%

Repository: anthropics/claude-code
Commit: ee81682

Evaluated: 3 months ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Upgrade Claude Model in Production API Client Upgrade AI Assistant to Latest Opus Model on AWS Bedrock Fix AI Agent Over-Calling Tools After Model Upgrade

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