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Deep dives into AI agents, coding tools, and building with LLMs.
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Anthropic's docs say the tokenizer introduced with Opus 4.7 can use up to 35% more tokens for the same text. Here is what that does to per-request cost, max_tokens, and cross-model comparisons.
deepseek-chat is retired after July 24, 2026. Migrate to DeepSeek V4, now served as deepseek-flash, with a what-maps-to-what table and a step-by-step checklist.
Fable 5 1M context workflows that actually work: whole-repo reviews, log archaeology, multi-doc synthesis - plus the honest math on when RAG still wins.
Claude effort levels explained: what low, medium, high, xhigh and max change on Fable 5, Opus 5.5 and Haiku 5.5, each default, and what a level costs.
Fable 5 long-running requests can run for minutes per turn and hours per run. Configure client timeouts, streaming keepalive, batch polling and background jobs.
Fable 5 memory tool setup with handlers, security and context editing. Anthropic says file-based memory helped Fable 5 three times more than it helped Opus 4.8.
A practical playbook for running Claude Fable 5 as the orchestrator over Sonnet and Haiku workers, with verified cost math on when the premium pays off.
Fable 5 prompt caching economics: cache-write vs cache-read pricing, 5-minute vs 1-hour TTL break-even math, and worked agent-loop examples.
Fable 5 task budgets give Claude a token countdown for a whole agentic loop. How the beta works, what it does not enforce, and where effort and max_tokens fit.
LLM API pricing for October 2026 per million tokens: Claude Haiku 5.5, Sonnet 5.5, Opus 5.5 and Fable 5.1 vs GPT-6, Gemini and DeepSeek, plus the caveats.
Frontier AI model directory for July 2026 covering Claude Fable 5, Opus 5, GPT-5.6, Sonnet 5, Gemini 3.1 Pro, Kimi K3 and DeepSeek V4, with verified pricing.
GPT-5.4 vs Gemini 3.1 Pro vs DeepSeek V4: pricing, benchmarks, context behavior, and license terms for the mid-tier models that carry most production traffic.
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