| Signal | Result | Reference |
|---|---|---|
| Tokenizer signature | Not measured | – |
| API surface | No other entry shares this exact contract | api_6cc6b678 |
| Context and output | 1,000,000 context · 128,000 max output | declared |
| Reasoning contract | Optional · efforts max, high, medium, low · default high | declared |
| Serving providers observed | None recorded yet | – |
Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows rather than single prompts, making it especially effective...
Supported parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstemperaturetool_choicetoolstop_ktop_pverbosity
defaults: {}
Cite this page as the evidence record for Anthropic: Claude Opus 4.6: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.
