Reviewed integration guides and dated API comparisons. Every factual comparison links to primary sources and states the billing assumptions it uses.
The same Claude Code / Codex session priced on the official Anthropic and OpenAI APIs, OpenRouter, CometAPI and Model.sale: Claude Opus 5.5, Sonnet 5.5, GPT-6 Astra and GPT-6.1 Sol, with every rate and assumption shown.
Read guide →Claude Opus 5.5, Sonnet 5.5, GPT-6 Astra and GPT-6.1 Sol priced on the same coding-agent session: official API rates vs Model.sale, the effect of cached tokens and which model to pick.
Read guide →Current Claude Opus API prices: Opus 5.5, Opus 4.8 and Fable 5.1 at Anthropic's official rates and on Model.sale, what one request and one agent step cost, and when the official API is cheaper.
Read guide →Are GPT-7 and Claude 6 out? What OpenAI and Anthropic have and have not announced as of October 2026, which rumors to ignore, and how to switch an integration on day one.
Read guide →Change the OpenAI base URL in the Python and Node SDKs, Aider, Cursor and Codex CLI, set OPENAI_BASE_URL, create a scoped key and send your first request.
Read guide →Understand per-million-token pricing, temporary reservations and the limits that protect a prepaid API balance.
Read guide →A safe checklist for connecting Cursor to a compatible model API without exposing an API key.
Read guide →A practical, dated comparison of a prepaid single-service API and OpenRouter's multi-provider routing model.
Read guide →A decision guide for developers comparing open-model inference platforms, latency-focused APIs and a prepaid gateway.
Read guide →A practical framework for comparing prepaid AI APIs with official and multi-provider billing without misleading discount claims.
Read guide →A practical way to compare ChatGPT-compatible APIs using the same token mix, streaming test and final settled charge.
Read guide →A practical comparison of Chinese model APIs based on compatibility, billing, reliability and commercial-use checks.
Read guide →A practical guide to ChatGPT-compatible Responses, Codex clients and GLM Chat Completions with one prepaid API key.
Read guide →A developer guide to Claude Opus 5.5 covering its model ID, 1M context, current official pricing, adaptive thinking, migration risks and availability checks.
Read guide →A worked cost breakdown for Claude Code sessions: fresh input, cached input and output tokens, why caching dominates, and how to estimate your own bill.
Read guide →How to choose between Claude Opus 5.5, Sonnet 5.5 and Haiku 4.5 for coding agents by cost per finished task, with a routing setup for Claude Code.
Read guide →A worked cost breakdown for Codex CLI and Cursor sessions: fresh input, cached input and output tokens, why caching dominates and how to estimate your bill.
Read guide →Fix the "The model does not exist" / model_not_found error (HTTP 404) in the OpenAI SDK, Cursor, Codex CLI and Aider: wrong ID, base URL, key restrictions and endpoint.
Read guide →What GPT-6 API calls really cost per chat message, per 100 requests and per coding session, with live Model.sale prices, the charged-token formula and a way to budget before you pay.
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