Blog

Which Claude model is best for coding depends on the benchmark: Fable 5 tops SWE-Bench Pro, Opus 5 wins agentic terminal work and costs a third as much.

The context window in Claude is 1M tokens on current models, but tool definitions, retained thinking and cached input all consume it. More is not better.

Creating a Claude API key takes four clicks. Expiration and workspace are chosen once and cannot be changed later, and calling several vendors changes the math.

How to use Claude Code: the 1M token context window, 80.8% SWE-bench score, Plan Mode, every surface it runs on, installation, and how it compares to Cursor.

How to use Claude Fable 5: the full benchmark table, the refusal and fallback contract that changes your code, mandatory retention, and what Opus 5 changed.

How to use Claude Opus 4.8: the official benchmark table, the honesty gain, Dynamic Workflows, the effort default that moved, and what to plan when migrating.

How to use Claude Opus 5: the full official benchmark table, the effort ladder that decides your bill, two breaking API changes, and the migration steps.

How to use Claude Sonnet 5: benchmarks against Opus 4.8, the effort ladder that drives cost, the denser tokenizer that inflates bills, and migration steps.

How to use Codex to generate slides: the seven-step workflow, the outline checkpoint that decides deck quality, prompts that pin exact claims, and its limits.

How to use Gemini 3.6 Flash: official benchmarks, where it loses to GPT-5.6 Luna and Sonnet 5, four breaking API changes, and the Flash-Lite and Cyber models.

How to use GPT-5.5: the Terminal-Bench lead, why the price rise is smaller than it looks, the 86% hallucination rate nobody quotes, and the loop it needs.

How to use GPT-5.6: what Sol, Terra, and Luna cost, the Terminal-Bench table and its four asterisks, the new max and ultra modes, and which tier to pick.

How to use GPT Image 2: the 99% text rendering that removes the composite step, what Thinking Mode does, where it loses to Nano Banana 2, and prompt changes.

How to use Nano Banana 2 Lite: four-second 1K images, the official benchmarks, the corrected cost math, what the 1K ceiling rules out, and how to prompt it.

GPT-5.6 is released. It shipped as three tiers, the rollout was gated for weeks which is why answers conflict, and Terra is the one worth migrating to.