Anthropic’s new API version rejects temperature, even at its default
Anthropic's 2026-10-21 API version rejects sampling parameters and some citation and document placements, and Python 2.0.0 and TypeScript 1.0.0 send it by default.
Tag: anthropic
Claude’s 17x quantum gate cut is measured against the slowest circuit
Anthropic says Claude Mythos 5 found an elliptic-curve circuit with 17x fewer gates for 12% more qubits. We read Table S3 of the paper: the 17x is against the most ...
Is Opus 5.5 fast mode worth $40 per million output tokens?
Since 15 October, fast mode on Claude Opus 5.5 needs no waitlist or beta header. We stacked every multiplier on the $8/$40 price and found the catch: fast and standard ...
Claude API traces won’t reach a collector on 4318 or a private IP
Anthropic shipped OpenTelemetry trace export for the Claude API on 14 October. We read the delivery rules: port 443 only, public hostnames only, redirects disable the destination, and spans aren't ...
Claude Haiku 5.5 is $0.10 per million until a prompt passes 100K
Anthropic released Claude Haiku 5.5 on 7 October at $0.10 and $0.50 per million tokens. The footnote matters more than the headline: past 100,000 prompt tokens the rate jumps fivefold.
Claude Sonnet 5.5 keeps $2 and $10 and retires thinking disabled
Same $2 and $10 price as Sonnet 5, benchmarks within two or three points of Opus 5.5, and a disabled thinking setting that now returns a 400.
Anthropic’s $11.6B Akamai deal buys CPUs, not GPUs
Seven years, $11.6 billion, up to about $20 billion with options, and not one GPU. We read Akamai's 8-K and the call coverage to see what Anthropic is actually buying.
Claude Opus 5.5 drops to $4 and $20, and breaks four Opus 5 habits
Anthropic cut Opus to $4 and $20 per million tokens and cache reads by 60%. The catch is four request shapes that Opus 5 accepted and Opus 5.5 rejects.
Anthropic moves retention into your own cloud, for 30 days
Somebody on your compliance team killed the Fable 5 pilot back in June, and the reason fit on one line: thirty days of your prompts parked on a vendor's servers. ...
Claude Fable 5.1 breaks forced tool use, cuts cache 75%
Swap claude-fable-5 for claude-fable-5-1 in your config and there is a decent chance your agent starts throwing 400s before it finishes a single turn. Anthropic shipped both models on 1 ...