[Bug]: claude-opus-4-7 / claude-sonnet-4-6 报错 thinking.enabled is not supported — 模型未被识别为 adaptive thinking 系列

[BernaLiuDev]

Bug Description

Using claude-opus-4-7 or claude-sonnet-4-6 via a third-party Anthropic-compatible provider (not official Anthropic) results in a 400 error:

API Error: 400 {"error":{"type":"<nil>","message":"\"..enabled\" is not supported for this model. Use \"..adaptive\" and \"output_config.effort\" to control thinking behavior."}}

After disabling thinking and continuing an existing conversation that previously had thinking blocks, a second error occurs:

API Error: 400 {"error":{"type":"<nil>","message":"\"..content.0: Invalid signature in thinking block\""}}

⚠️ Note: The Anthropic provider used here is a third-party relay/aggregator, not the official api.anthropic.com. However, the provider supports Claude 4.x models and follows the same Anthropic API spec.

Root Cause (traced via source code)

In getAnthropicReasoningParams() (v1.9.11), claude-opus-4-7 is not recognized by isSupportAdaptiveThinkingClaudeModel() or isClaude46SeriesModel(), so it falls through to the legacy branch:

// Falls through to this — WRONG for Claude 4.x
return { thinking: { type: "enabled", budgetTokens: ... } }

Claude 4.x API no longer accepts type: "enabled" and requires thinking: { type: "adaptive" } + output_config.effort instead.

Steps To Reproduce

1. Configure a third-party Anthropic-compatible provider
2. Select model claude-opus-4-7 or claude-sonnet-4-6
3. Enable any reasoning effort level (lightbulb icon in input bar)
4. Send any message → first 400 error appears
5. Disable thinking, continue existing conversation → second 400 error ("Invalid signature in thinking block")

Expected Behavior

Cherry Studio should send thinking: { type: "adaptive" } + output_config.effort for Claude 4.x models (claude-opus-4-7, etc.), consistent with the current Anthropic API spec.

Workaround

• Disable thinking (lightbulb icon → off / default)
• Use Cmd+K to reset context in existing topics that previously had thinking blocks enabled

Platform

macOS

Version

v1.9.11