Anthropic just shipped Opus 4.8. While everyone chases speed, the headline feature is weird: it's 4x less likely to write you broken code and not tell you about it. And honestly, that's the one that matters.
The big stuff:
- Honesty + โ stops and flags what it's unsure of instead of bluffing
- Coding record โ SWE-Bench Pro 64.3% โ 69.2%, ~10 points clear of GPT-5.5
- Beat OpenAI on OpenAI's own GDPval โ 1890 vs GPT-5.5's 1769
- Fixed the 4.7 token mess โ ~61% cheaper doc reads, less chatty
- Same price โ $5/$25 per M tokens, third Opus with no price bump
Also new: dynamic workflows in Claude Code (parallel sub-agents that self-check โ the Bun creator rewrote 750k lines into a new language in 11 days), effort control in the app, fast mode 2.5x faster + 3x cheaper, 1M context default, and Mythos (a model above Opus) coming in the next few weeks.
My take: 4.7 was rough. 4.8 isn't about the benchmarks โ it's that Anthropic fixed the boring stuff (context, compaction, token bleed). If 4.7 burned you, this one earns it back.
๐ Full Opus 4.8 cheat sheet PDF pinned below โ every benchmark, every new feature, my switch verdict, all on one page.
Comment: switching back to Claude, or fully GPT-pilled? ๐
[Watch the video here โถ๏ธ]