it’s a very good model, I spent a lot of time diving into it- longer write up coming
but try it on lower effort for tasks that need less verification or have fewer edge cases, switching effort no longer breaks prompt cache as well
some tips for Claude Fable 5.1
Try Fable 5.1 at low effort | Fable 5.1 at low effort is often competitive with Opus and Sonnet on $ / task while scoring higher. on CursorBench 3.2.0, Fable 5.1 at low effort is at parity w/ Fable 5 at high effort at a third of the cost.
Prompt cache reads are 4x cheaper for Fable 5.1 | cache hits dropped from $1.00 to $0.25 / MTok. if you are using prompt caching, Claude Console can monitor your prompt cache hit rate. also run “/claude-api cost-optimize” in Claude Code to run diagnostics on your prompt cache configuration. see pricing:
https://t.co/d5sEMwmT9H
Simplify your prompts | remove verification rituals, emphasis boosters, scratchpad scaffolds, stale few-shot examples, or contradictory rules. in Claude Code, run “/claude-api prompt-audit” to inspect prompts or skills for common anti-patterns. see our prompt guide:
https://t.co/QgJLf0r0hE
Change effort mid-conversation w/o breaking the prompt cache | Previously, mid-conversation changes to effort invalidated the cache. see docs:
https://t.co/tAJUJBCNXk
for migrating to Fable 5.1, see the migration guide and run "/claude-api migrate" in Claude Code to help update API configuration to use Fable 5.1.
https://t.co/eDcnAEUStM
Fable 5.1コスパ悪い論、ちょっと分析したんだけど、
H I G H と M A X は 使 う な!!!!
って感じ。
ってかFable 5.1 Low とMediumのコスパが異様に良くて、特にLowはベンチによってはSolよりコスパ良さげ(特にLoopを回す用途だと)
HighとMaxのコスパは本当にバカ悪い()
Xhighは高いけど、Fable 5のMaxくらいのテンションで使ってOKな感じかな...?レート制限余ってたら使う用途かも
Sometimes it's easier to show than tell. We're sure this update will help with that. 👀
GitHub CLI now has a repeatable --attach flag that uploads a local image or video. Reference it inline in an issue, pull request, or comment body.
Available now to all users on GitHub across all plans. 🎉
https://t.co/2oRtlSHdPT