new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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anthropic/models

2 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Claude 4 model variants and model IDs

Claude 4 is available in two variants: Claude Sonnet 4 and Claude Opus 4. The model ID for Claude Sonnet 4 is 'claude-sonnet-4-20250514'. Claude Sonnet 4 offers balanced performance suitable for most enterprise applications with improvements over Sonnet 3.7, achieving 72.7% on SWE-bench. Claude Opus 4 is Anthropic's most powerful model and best coding model, achieving 72.5% on SWE-bench and 43.2% on Terminal-bench, excelling at sustained performance on long-running tasks requiring focused effort and thousands of steps.

Anthropic model IDs available

Claude model IDs available through Anthropic include: claude-opus-5, claude-sonnet-5, claude-fable-5, claude-opus-4-8, claude-opus-4-7, claude-opus-4-6, claude-sonnet-4-6, claude-opus-4-5, claude-haiku-4-5, claude-sonnet-4-5, claude-opus-4-1, claude-opus-4-0, and claude-sonnet-4-0. For a full list of available models, see the Anthropic documentation. Any available provider model ID can be passed as a string if needed.

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