Grok Code Fast 1

Name: Grok Code Fast 1
Author: xAI

Released

2025-08-27

Last refreshed

2026-07-09

Status

Researched 148d ago

DeprecatedProprietaryCommercial use: conditionalCodingRAGAgentsLong contextClassificationJSON / Tool use

Grok Code Fast 1 is a legacy integration reference; evaluate Grok Build 0.1 before starting new work.

xAI releases · 18 in the last 12 months · this family litChangelog →

Specifications

Family: Grok 4
Released: 2025-08-27
Context: 256K
Parameters: 314B
Architecture: Mixture of Experts
Specialization: code
Openness: Proprietary
License: ProprietaryCommercial use: conditional
Weights: Not released
Code: Unknown

Created by

xAI

Ethical AI for universal truth-seeking

San Francisco, California, United States

Founded 2023

Website

Pricing

Output / 1M

Input / 1M

Cheapest of 1 route · Microsoft Foundry

Providers(1)

Microsoft Foundry

View 1 provider route

Links

Website

This model is deprecated. xAI recommends switching to Grok Build 0.1.

About

xAI's Grok Code Fast 1 is a code-specialized Mixture-of-Experts model released August 27, 2025. It was retired on May 15, 2026; xAI lists grok-build-0.1 as its direct replacement for current coding-agent work.

Providers(1)

Compare API pricing across 1 tracked provider route for input and output tokens, batch, and cached reads when available.

Provider	Input / 1M	Output / 1M	Route
Microsoft Foundry	-	-	ServerlessPartial

Deprecated provider routes(2)

Provider	Status	Catalog ID
OpenRouter	Deprecated	x-ai/grok-code-fast-1
xAI Console	Deprecated	grok-code-fast-1

Available via routers & gateways(6)

LiteLLM

Gateway

Open-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.

Free OSSMicrosoft Foundry

OpenRouter

Hybrid

Unified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.

PassthroughxAI Console

Portkey

Gateway

Production AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.

SubscriptionMicrosoft Foundry

Azure AI Foundry Model Router

Router

Microsoft Azure AI Foundry's native model router that uses a trained ML model to route each prompt in real time to the optimal Azure-hosted model, with Balanced/Cost/Quality mode selection and automatic failover.

PassthroughMicrosoft Foundry

Helicone

Gateway

Observability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.

SubscriptionMicrosoft Foundry

Kong AI Gateway

Gateway

Multi-LLM AI gateway built on Kong Gateway 3.x, adding semantic routing, load balancing, guardrails, and MCP traffic analytics as plugins over Kong's existing API management platform.

SubscriptionMicrosoft Foundry

Capabilities

JSON / Tool useStructured Outputs

Benchmark peer barsfor Coding

SWE-bench VerifiedRank 66 of 94

Claude Fable 5

96.0

Claude Opus 5

96.0

Claude Mythos Preview

93.9

Claude Opus 4.8

88.6

Grok Code Fast 1current

70.8

Benchmark scores(1)

Scores are benchmark-specific and are direction-aware: the same numeric gap can mean very different outcomes across suites. Use the leaderboard context and this model's provider route to decide whether the winning margin is meaningful for your workload.