Posts tagged reasoning
9 posts about reasoning.
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LLM Structured Outputs: 4 of 12 APIs Return Valid but Wrong JSON
Structured outputs measured on 12 LLM APIs: 100% schema-valid JSON, wrong values on 4 models with thinking on, same call billed 30 to 4,959 prompt tokens.
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LLM Thinking Controls: What 13 Models Accept, Ignore, or Enforce
reasoning_effort and thinking_budget across 13 LLM APIs: three vendors enforce budgets to the token, others silently ignore them, a cap of 16 can burn 97.
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Claude Opus 5 vs Opus 4.8, Measured: Same Price, 3x Apart
Opus 5 and Opus 4.8 share a $5/$25 rate card, yet Opus 5 billed 3.1x more on identical tasks out of the box. Where it goes, and the switch that closes it.
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Gemini 3.6 Flash: the Thinking Dial That Moves Cost 30x (Measured)
Gemini 3.6 Flash bills reasoning you never see, and one request setting swings the same task's cost up to 30x. Measured across five task types, with the catch.
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GPT-5.6 Prompting Guide: Two Defaults That Bill 1.5x and 10x More
GPT-5.6 defaults are expensive: omitting reasoning_effort bills 1.5x vs 'none'; unmarked prefixes cost 10x cached reads. Request-shape playbook, measured.
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Kimi K3 API Pricing, Measured: Turn Off the 'Always-On' Reasoning
Kimi K3's docs say reasoning can't be disabled. reasoning_effort:'none' works and cuts simple queries 6x. Measured: effort dial, cache floor, 9-language rates.
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LLM Token Usage: Why a 4-Token Answer Bills 217 Tokens
Measured across GPT-5.6, Claude Fable 5, Qwen3.7-max and five more families: reasoning dominates the output bill. How to read every usage field, and cap them.
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GPT-5.6 Cost Guide: Prompt Caching 90% Off, Reasoning Effort
GPT-5.6's two cost levers, measured: explicit breakpoints bill cached input at 10% of the rate, and not sending reasoning_effort bills 1.5x as much as none.
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GLM 5.2 Reasoning Effort: the Setting That Cuts Cost 20x (Measured)
Same coding answer: $0.0031 with reasoning effort set right vs $0.062 on GLM 5.2's unbounded default. 20x cheaper, 30x faster. How to set the dial per task.