Claude Opus 4.7: Anthropic's frontier model

Claude Opus 4.7 is Anthropic's flagship model. It leads SWE-bench (the most-watched coding benchmark) and produces refactor patches a senior engineer is more likely to merge unchanged. It writes with more taste than any other frontier model. The 1M-token context window is in beta; the 200K production window is still plenty for most workloads. Extended thinking mode is its analogue to GPT-5.5's reasoning-high, slower and more expensive but materially better on hard problems. The case against: priced at $15/$75 per million tokens, it's the most expensive frontier general-purpose model in the lineup. For most daily work, Sonnet 4.6 ($3/$15) gets ~90% of Opus's coding quality. Save Opus for architecture decisions, hairy refactors, and writing where voice matters.

Specs

Best at

• Coding — SWE-bench leader; patches with fewer surprises.
• Writing voice — best-in-class for tone and editorial taste.
• Long-form reasoning — fewer logical drift errors.
• Instruction following — handles complex multi-step prompts faithfully.

Where it loses

• Cost — 5x GPT-5.5 per output token. Sonnet 4.6 covers most daily use at 1/5 the price.
• Tool calling — GPT-5.5's structured outputs slightly more reliable in production agent loops.
• Speed — extended thinking adds noticeable latency.

Frequently asked questions