Blog
Integration guides, model comparisons, and real-world GPT-5 / Codex use cases.
- TOOLING
Cursor IDE vs Codex CLI: which to use with your own API key
Compare Cursor IDE and Codex CLI when working through Codex Key: where each is faster, cheaper, more ergonomic, and when to run both.
·cursor · codex-cli · toolingRead → - MODEL COMPARISON
GPT-5 vs Claude 4 for coding via Codex
Compare GPT-5.4 / 5.5 and Claude Sonnet 4 / Opus 4 on real coding tasks in Codex CLI and Cursor: quality, latency, cost per actual task.
·gpt-5 · claude-4 · codexRead → - QUICKSTART
Run GPT-5 through Codex Key in 5 minutes
Step-by-step: get a Codex Key API key, plug it into Cursor / Cline / Codex CLI, and work with GPT-5.4, GPT-5.5 and Codex — no OpenAI account, no waitlist.
·quickstart · gpt-5 · cursorRead → - API GUIDE
Reasoning effort: low / medium / high / xhigh — picking the right level
When to use low, when medium, when high, and what xhigh is even for. Real scenarios, quality and cost measurements through Codex Key.
·reasoning · api · optimizationRead → - BILLING
Codex Key token economy: what's counted and how to pay less
How Codex Key meters tokens, what the tariff coefficients mean, which optimizations actually cut your bill, and which are myths.
·billing · tokens · optimizationRead → - MODEL COMPARISON
GPT-5.4 vs GPT-5.5 vs Codex: which model to pick
Compare GPT-5.4, GPT-5.5 and Codex on speed, price and quality. When to use the flagship, when to use mini, when to use Codex — real numbers and real scenarios.
·gpt-5 · comparison · modelsRead →