project
The core API endpoint for sending prompts to and receiving responses from Anthropic's Claude models, including tool use, streaming, and usage billing.
No evidence-backed relationships are recorded.
A developer's Claude agent crashed on 388 of 1,200 runs because its loop answered only the first of several parallel tool calls. Deleting the extra calls stopped the errors but cut its eval score from 46 to 38 out of 50.
Reality
One developer's no-key test of four LLM gateways found model lists out of step with vendor docs, the author's own falling from 477 to 199 models in a week. Any model ID read from these lists is a dated observation and should be snapshotted before it goes into code.
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The Responses and Messages dialects specify tool declarations, streaming and reasoning knobs. A Java 21 library published to Maven Central at 0.18.0 argues the unspecified half is where retrieval, injection and veto actually live, and offers to host it in your own process.
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A developer parsed his own Claude Code transcripts and found 1.99 billion cached reads against 62 million writes, which turns the length of your context into a recurring charge on every remaining turn rather than a setting you pick once.
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AWS's India geographic profiles keep GPT-5.6 Terra and Luna routing between ap-south-1 and ap-south-2, which answers local processing rules and shrinks the capacity pool that cross-Region inference exists to widen.
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List is $5 per million tokens in and $25 out, with a 1M-token window. The figures that decide an agent budget come from multiplying those against turn counts and Anthropic's rate limit tiers.
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A new beta fingerprints each request and names the first structural divergence from a prior response id. Until now the only signal was cache_read_input_tokens going to zero.
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