Model detail
Grok Build 0.1
Grok Code Fast 1 is a speedy and economical reasoning model that excels at agentic coding. With reasoning traces visible in the response, developers can steer Grok Code for high-quality work flows.
Model specs
- Model ID
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grok-code-fast-1
- Context length
- 256K
- Max output
- 10K
- I/O modalities
- Released
- 2025-08
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API endpoints
One MixRoute gateway, OpenAI-compatible
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OpenAI-compatible
/v1/chat/completionsPOST
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Pricing
Flat rate, unit: /1M Tokens
Input
$0.2000 /1M Tokens
Completion
$1.5000 /1M Tokens
Cache read
$0.0200 /1M Tokens
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Selection summary
Quickly judge whether it fits your workload
What is this model good for?
Grok Code Fast 1 is a speedy and economical reasoning model
Grok Code Fast 1 is a speedy and economical reasoning model that excels at agentic coding. With reasoning traces visible in the response, developers can steer Grok Code for high-quality work flows.
What should you check before using it?
256,000 context, 10,000 output tokens
xAI model that supports reasoning, tool calling and structured output. Knowledge cutoff: 2025-09-30. Released 2025-08-28.
Why use it through MixRoute?
Grok Build 0.1 keeps its 256,000-token context on one route
The full 256,000-token context stays reachable on the same route. MixRoute serves Grok Build 0.1 on the OpenAI-compatible endpoint /v1/chat/completions; point your existing client at https://api.mixroute.ai/v1 with the model ID grok-code-fast-1 and re-run your integration tests.
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Capabilities & compatibility
Unconfirmed capabilities stay "Unknown," no guesses
Tool calling
Grok Build 0.1 supports function and tool calls.
tools definition; the response returns tool_calls to execute and feed results back.
Structured output
Grok Build 0.1 can produce JSON-formatted output on demand.
response_format: { type: "json_schema" } forces valid JSON output.
Streaming
Grok Build 0.1 supports streamed responses.
stream: true streams tokens incrementally, so chat UIs render as they arrive.
Prompt caching
Grok Build 0.1 supports prompt caching under supported routing conditions.
OpenAI SDK
Call Grok Build 0.1 through MixRoute's OpenAI-compatible endpoint.
base_url to https://api.mixroute.ai/v1; everything else follows the OpenAI style.
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Token cost estimator
Live estimate from this page's pricing, not an actual bill
Share of the same prefix read repeatedly, up to 100%
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FAQ
Grok Build 0.1 is billed per use and the record publishes no free-tier allowance. The current published rates are input $0.2000 per 1M tokens and output $1.5000 per 1M tokens. Trial credit or promotional quota is tied to your account rather than to the model, so check the console before planning around a free tier.
One endpoint, a testable decision
Test this model and alternate routes with the same request format
Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.