Low-cost fast model with extended reasoning for latency-sensitive workloads.
API ID
grok-4-1-fast-reasoningOverview
- Context
- 200,000 tokens
- Input
- Text
- Output
- Text
- Providers
- Azure AI Foundry
- Released
- Jun 2025
- API compatibility
- OpenAI Chat Completions
Recommended for
- General-purpose reasoning
- Long-context analysis
- Production assistants
Keep in mind: A specialized AI Service matches the workload more directly
Supported features
- Function calling: Not supported
- Structured outputs: Not supported
- Vision: Not supported
- Streaming: Supported
- Reasoning: Supported
- Prompt caching: Not supported
Supported parameters
View API reference frequency_penaltyfunction_callfunctionslogit_biaslogprobsmax_completion_tokensmax_tokensnparallel_tool_callspredictionpresence_penaltyprompt_cache_keyresponse_formatseedservice_tierstorestreamstream_optionstemperaturetool_choicetoolstop_logprobstop_p