3 Assumptions That Broke Before I Got gpt-oss-120b Working Through the Anthropic SDK

Short summary

A developer documents three assumptions that broke while connecting OpenAI's open-weight gpt-oss-120b model through Sakura AI Engine's free tier using the Anthropic Python SDK. The free tier's credit-card prompt is identity verification, not billing. The Anthropic SDK requires auth_token= instead of api_key= for Bearer-auth endpoints. Response content must be filtered by type rather than indexed directly, as ThinkingBlock objects lack a .text attribute. Each fix is a one-line change.

• •Sakura AI Engine's free tier credit-card prompt is identity verification, not a billing trigger
• •Anthropic SDK needs auth_token= (Bearer auth) instead of api_key= (x-api-key) for Sakura's compatible endpoint
• •Filter resp.content by block type instead of indexing content[0] to avoid ThinkingBlock attribute errors

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