https://docs.byesu.com/en/articles Byesu API Articles en-US https://docs.byesu.com/en/articles/claude-message-threads-gateway https://docs.byesu.com/en/articles/claude-message-threads-gateway Anthropic opened the Message Threads beta (message-threads-2026-08-12) on 2026-11-02. Checked against the official docs: the 7 ways an API gateway or proxy breaks threads — key rotation 404s, the thread field silently dropped, fixed-field mismatches, cross-key retries, rewritten error codes — and how to fix each on the gateway and the client. Tue, 03 Nov 2026 00:00:00 GMT https://docs.byesu.com/en/compare/gemini-4-argon-vs-carbon https://docs.byesu.com/en/compare/gemini-4-argon-vs-carbon Gemini 4 Argon vs Carbon side by side: what Google has published about each, the same $2/$10 introductory price, and the key difference for developers — Argon is generally available via API, Carbon is in phased rollout. Checked 2026-10-29. Thu, 29 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/guide/openai-gpt-4o-shutdown-2027 https://docs.byesu.com/en/guide/openai-gpt-4o-shutdown-2027 OpenAI removes gpt-4o, gpt-4o-mini, gpt-4.1 and gpt-4.1-mini from the API on January 14, 2027; the official replacement is gpt-6-luna. Full retirement table, the shutdown_date API field, grep patterns, what is not a drop-in, and the complete 2026–2027 OpenAI retirement calendar. Verified 2026-10-26. Mon, 26 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/compare/claude-opus-5-5-vs-gpt-6-1-sol https://docs.byesu.com/en/compare/claude-opus-5-5-vs-gpt-6-1-sol Claude Opus 5.5 vs GPT-6.1 Sol side by side: official prices ($4/$20 vs $2/$10), context windows, reasoning controls and tool calling, plus how to A/B both with one byesu key. Thu, 22 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/compare/claude-opus-5-5-vs-sonnet-5-5 https://docs.byesu.com/en/compare/claude-opus-5-5-vs-sonnet-5-5 Claude Opus 5.5 vs Claude Sonnet 5.5 from Anthropic’s official specs: $4/$20 vs $2/$10, same 1M context and 128K output, different default effort and latency — and when each fits. Thu, 22 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/compare/gpt-6-1-sol-vs-gpt-6-astra https://docs.byesu.com/en/compare/gpt-6-1-sol-vs-gpt-6-astra GPT-6.1 Sol vs GPT-6 Astra from OpenAI’s official docs: near-Astra performance at one-fifth the list price ($2/$10 vs $10/$50), the same 1.05M context, and when Astra is still worth it. Thu, 22 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/guide/openai-codex-migration-2026 https://docs.byesu.com/en/guide/openai-codex-migration-2026 OpenAI retired gpt-5-codex, the Codex snapshots, chat-latest, and several gpt-4o previews on 2026-07-23. Full model-to-replacement table and migration steps for code that still pins these IDs. Retirement list verified 2026-07-16. Tue, 13 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/guide/prompt-caching https://docs.byesu.com/en/guide/prompt-caching How prompt caching actually bills: a one-time write premium (~1.25x) and cheap cache reads as low as 0.1x. How to structure requests so the expensive prefix is written once and read many times — Claude cache_control breakpoints, OpenAI automatic caching, and how to verify hits. byesu passes caching through unchanged. Tue, 13 Oct 2026 00:00:00 GMT https://docs.byesu.com/en/compare/image-video-api-pricing https://docs.byesu.com/en/compare/image-video-api-pricing Per-image API prices for gpt-image-2, gpt-image-2.5, Nano Banana Pro, Nano Banana 2 and Nano Banana 2.1 on byesu ($0.007–$0.009, same price at 1K/2K/4K), next to OpenAI and Google list prices checked on 2026-10-22. Sun, 12 Jul 2026 00:00:00 GMT https://docs.byesu.com/en/compare/byesu-vs-openrouter https://docs.byesu.com/en/compare/byesu-vs-openrouter A fair, source-checked byesu vs OpenRouter comparison: API formats incl. Anthropic Messages, prompt caching billing, fees, payments, image APIs and model coverage. Sat, 11 Jul 2026 00:00:00 GMT https://docs.byesu.com/en/compare/claude-opus-4-8-vs-gpt-5-6 https://docs.byesu.com/en/compare/claude-opus-4-8-vs-gpt-5-6 Claude Opus 4.8 vs GPT-5.6 compared: official list prices, Effort Control vs ultra mode, caching, and workload-based picks — A/B both with one byesu key. Sat, 11 Jul 2026 00:00:00 GMT https://docs.byesu.com/en/compare/gpt-5-6-vs-grok-4-5 https://docs.byesu.com/en/compare/gpt-5-6-vs-grok-4-5 GPT-5.6 Sol/Terra/Luna vs Grok 4.5 compared: official list prices, context windows, output-token efficiency, caching — and how to A/B test both with one key. Sat, 11 Jul 2026 00:00:00 GMT https://docs.byesu.com/en/guide/sora-api-alternative https://docs.byesu.com/en/guide/sora-api-alternative OpenAI's Sora API shut down on 2026-09-24. What it affected, how to plan a move to another video provider, and why byesu currently offers image generation only (gpt-image-2, gpt-image-2.5, Gemini image models). Sat, 11 Jul 2026 00:00:00 GMT