fix: support adaptive thinking for Claude Opus 4.8/4.7/… - #568
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Opus 4.8/4.7 no longer accept thinking.type="enabled" with budget_tokens and return 400 errors. This commit adds: - ThinkingFormat enum (ADAPTIVE/ENABLED) with @volatile cached state - Model name heuristic (prefersAdaptiveThinking) for known models - Error-driven auto-fallback (isThinkingTypeError) for proxy routes - Single-flip guard per request to prevent infinite retry loops - display="summarized" for Opus to return thinking content
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问题
Claude Opus 4.8/4.7 不再支持
thinking.type: "enabled"+budget_tokens，API 返回 400：
"thinking.type.enabled" is not supported for this model同时 Opus 4.8/4.7 默认
display: "omitted"，返回空 thinking block，需显式设置
display: "summarized"才能展示思考内容。方案
ThinkingFormat枚举（ADAPTIVE/ENABLED）+@Volatile缓存prefersAdaptiveThinking()按模型名启发式匹配（opus-4-8/4-7/4-6/sonnet-4-6）{type:"adaptive", display:"summarized"}；ENABLED 保持原有{type:"enabled", budget_tokens:N}isThinkingTypeError()检测 thinking 相关 400 错误，自动翻转并缓存，不消耗 retry 额度兼容性
修改文件
ClaudeProvider.kt(+141 / -22)验证