Anthropic: Claude Opus Latest
~anthropic/claude-opus-latestThis ID redirects to Anthropic: Claude Opus 5.5.
- Modalities
- text+image+file->text
- In / out price
- $4 / $20
- Context
- 1M
- Released
- Apr 21, 2026
- Knowledge cutoff
- —
per 1M
This model always redirects to the latest model in the Claude Opus family.
Supported parameters
include_reasoningInclude reasoning
Include a reasoning summary in the response.
max_completion_tokensMax completion tokens
Same idea as max_tokens. Some newer models use this field instead.
max_tokensMax tokens
Upper bound on generated tokens. Output stops at the limit.
reasoningReasoning
Enable or configure reasoning. The fields differ by model.
reasoning_effortReasoning effort
How much compute to spend reasoning. Often low, medium, or high.
response_formatResponse format
For example json_object or json_schema, to constrain the shape.
stopStop
Stop when these strings are produced. A string or an array of strings.
structured_outputsStructured outputs
Generate a parseable structure that follows a JSON Schema.
tool_choiceTool choice
Whether to call a tool: auto, none, or a named function.
toolsTools
Function definitions the model may call via tool_calls.
verbosityVerbosity
Ask the model for a shorter or longer answer.