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Frontier models, used properly.

Practical, tested tips for getting more out of the frontier models you actually use — Claude, GPT, Gemini and whatever ships next. Written by the same newsroom, held to the same no hype standard, and archived permanently.

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Latest tips

Monday, Wednesday, Friday · two minute read

Wednesday, October 21, 2026 · GPT-6.1 Sol (OpenAI)

GPT-6.1 Sol's New 12 Hour Prompt Cache Costs Twice as Much to Write, So Turn It On Only for Prefixes That Outlast 30 Minutes

OpenAI added a 12 hour prompt cache to its API on October 20. For GPT-5.6 and later, including GPT-6.1 Sol, a 12 hour cache write costs 2.5 times the input rate versus 1.25 times for the default 30 minutes, while reads cost the same either way. It pays off only for stable prefixes that come back after long gaps.

GPT-6.1 SolOpenAIPrompt Caching
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Friday, October 9, 2026 · Claude Haiku 5.5 (Anthropic)

Claude Haiku 5.5 Gets Five Times Pricier Past 100,000 Tokens, and Its Default Thinking Eats Your max_tokens

Haiku 5.5 is cheap at $0.10 per million input tokens, but only for prompts up to 100,000 tokens. Above that line every rate jumps fivefold, adaptive thinking is on by default at medium effort, and thinking tokens count against max_tokens. Size your prompts and limits before you migrate.

Claude Haiku 5.5AnthropicPricing
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Friday, October 2, 2026 · Claude Sonnet 5.5 (Anthropic)

Claude Sonnet 5.5 Thinks by Default, and between_tools Is the Only Way to Turn It Down

Claude Sonnet 5.5 runs adaptive thinking on every request unless you say otherwise, defaults to high effort, and no longer accepts thinking disabled or budget_tokens. Teams porting latency sensitive Sonnet 5 code should switch to thinking between_tools, set effort explicitly, and take advantage of a prompt caching minimum that drops to 512 tokens.

Claude Sonnet 5.5AnthropicThinking
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Wednesday, September 23, 2026 · Grok 4.7 (xAI)

Grok 4.7 Bills You Full Input Price Without a prompt_cache_key, and Its Reasoning Items Have to Come Back Unchanged

xAI shipped Grok 4.7 on September twenty first with a 500k context window and a price that doubles past 200k prompt tokens. Two documented behaviors decide what you actually pay and whether multi turn agents keep their reasoning: setting prompt_cache_key, and returning reasoning items unchanged.

Grok 4.7Prompt CachingReasoning
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Friday, September 11, 2026 · North-Small-Translate-1.0 (Cohere Labs)

Friday Tip: Put Cohere's New North-Small-Translate-1.0 Through Its Own Multi Pass Mode Before You Judge It

Cohere Labs just released an open weight, 218 billion parameter translation model with a built in multi pass workflow that can meaningfully change output quality depending on how you call it. Here is what to test before you decide whether it replaces your current translation vendor.

Coheretranslationopen weight
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Wednesday, September 9, 2026 · Mercury 2.5 (Inception)

Mercury 2.5 Takes reasoning_effort, and Its Stream Arrives in Refining Blocks Rather Than Tokens

Inception's Mercury 2.5 shipped Monday and drops into any OpenAI compatible client, which is exactly why two of its behaviors get missed. It accepts a reasoning_effort parameter, so its speed is a dial rather than a fixed property, and its optional diffusing stream returns blocks of noisy tokens that refine in place instead of appending left to right. Set the first deliberately. Keep the second away from anything that parses.

InceptionMercury 2.5Diffusion Models
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Saturday, September 5, 2026 · MAI-Transcribe-2 (Microsoft)

MAI-Transcribe-2 Ships With Timestamps and Diarization Off, and You Have to Ask for the Model Itself

Microsoft's new transcription model is ten cents an hour, but the Azure AI Speech defaults do not give you it. enhancedMode.enabled is false, diarization is false, and word timestamps are none, so an unmodified request returns a cheap transcript from a different model with none of the structure you wanted.

MicrosoftSpeech to TextAPI Defaults
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Wednesday, August 19, 2026 · GLM-5.3

GLM-5.3 Has No Off Switch for Thinking, and reasoning_effort Silently Defaults to max

Z.ai's GLM-5.3, released August 14, drops the ability to turn reasoning off entirely. Its documentation states that the model supports reasoning only and that disabling reasoning is not supported. The one lever left is reasoning_effort, which accepts low, high and max, and defaults to max. If you port a GLM-5.2 integration without touching it, every call you make, including trivial ones, now runs at the most expensive setting available.

GLM-5.3Z.aiCost Control
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Monday, August 17, 2026 · NVIDIA Nemotron 3.5 Lightning 30B (BF16)

Nemotron 3.5 Lightning's Million Token Window Is an Eight GPU Feature in BF16, Not a Single Card One

NVIDIA's new Nemotron 3.5 Lightning 30B advertises a one million token context, but the BF16 checkpoint only delivers the full window across eight H100 GPUs with tensor and expert parallelism. On a single 80GB H100 you are validated to 256K, so plan your hardware around the context you actually need before you promise a million.

NVIDIANemotronSelf Hosting
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Monday, August 10, 2026 · Qwen3.8-Max

Qwen3.8-Max Has a Million Token Context Window That Only Accepts 991,808 Tokens of Input

Alibaba's new 2.4 trillion parameter flagship advertises a 1,000,000 token context window, but its documented maximum input length is 991,808 tokens, and 983,616 in thinking mode. Teams sizing long context jobs against the round number will hit a wall. The bigger lever is the cache: implicit cached input is priced at a quarter of standard input.

Qwen3.8-MaxLong ContextCost Control
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Friday, August 7, 2026 · LFM2.5-2.6B

LFM2.5-2.6B Turns Your Laptop Into a Free Agent Runtime, but Only If You Route the Right Work to It

Liquid AI's LFM2.5-2.6B, released 4 August, runs a full tool calling agent at 220 tokens per second on an M5 Max in under 2.5 GB of memory. The move that pays is not replacing your frontier model. It is splitting your agent loop so the high volume mechanical turns run locally at zero marginal cost and only the hard turns hit the paid API.

LFM2.5-2.6BLocal AgentsCost Control
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Wednesday, August 5, 2026 · DeepSeek V4-Flash

DeepSeek V4-Flash Ships With Thinking On at High Effort, and Your Temperature Setting Does Nothing

Teams adopting DeepSeek V4-Flash 0731 for its fourteen cent input price are quietly paying for high effort reasoning on every call, because thinking mode is on by default. Four sampling parameters they carried over from another provider are being accepted and silently ignored at the same time.

DeepSeek V4-FlashCost ControlAPI Configuration
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