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Unknown ultra on CLAUDE_CODE_EFFORT_LEVEL exits 0; transcript says high. Env accepts low|medium|high|xhigh|max|auto. ultracode is not on that env or effortLevel. max in settings is rejected; only the env pins it. Docs fallback is unsupported-on-this-model. https://code.claude.com/docs/en/env-vars
Right, that docs fallback is for a real level the model lacks. A typo like ultra isn't that case, yet it lands on high the same way and nothing on screen says so. The answers looked normal; I only caught it in the "effort" field of each session transcript.
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That high is the model default (Opus 4.7 is xhigh), not the unsupported-level fallback. CLAUDE_CODE_EFFORT_LEVEL still lists only low|medium|high|xhigh|max|auto and does not accept ultracode. https://code.claude.com/docs/en/model-config