Observed Signal · Jul 14, 2026 · Deprecation · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Models Deprecate budget_tokens; Switch to Adaptive Thinking
A developer describes migrating code after fixed token budgeting (budget_tokens) used with older Opus models stopped working on Opus 4.7, 4.8 and Fable 5. The fixed-token budget parameter returns a 400 error on newer models and has been replaced by "adaptive thinking", where the model controls thinking extent and an output_config effort level (low|medium|high|xhigh|max) guides overall token spend. The author outlines the migration steps, recommended effort levels per workload, a gotcha about thinking display defaults, and lessons about avoiding fragile abstractions around vendor-specific knobs.
Technical deprecation affects developers integrating these LLM models: code and costing patterns must change (migration steps provided). It's relevant to teams using these models but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Opus 4.5 and earlier accepted thinking: { type: "enabled", budget_tokens: N } to set a fixed token thinking budget.
- On Opus 4.7, 4.8, and Fable 5, requests using budget_tokens return HTTP 400 — the fixed token budget parameter is removed.
- Replacement pattern uses thinking: { type: "adaptive" } plus output_config: { effort: "low|medium|high|xhigh|max" } to influence token spend.
- Other parameters (temperature, top_p, top_k) also return 400 on Opus 4.7+ and must be stripped.
- Migration checklist: search for budget_tokens, replace with adaptive thinking, add per-call effort levels, remove budget helper, run test requests asserting response.model.
Connected Companies & Entities
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