Grok 4 Fast Non-Reasoning

Released
2025-09-01
Last refreshed
2026-10-17
Status
Researched 23d ago
DeprecatedProprietaryCommercial use: restrictedMultimodalLong contextVision

Grok 4 Fast Non-Reasoning is a legacy integration reference; evaluate Grok 4.7 before starting new work.

xAI releases · 19 in the last 12 months · this family litChangelog →
Specifications
Family
Grok 4
Released
2025-09-01
Context
2M
Architecture
Decoder Only
Specialization
general
Openness
Proprietary
License
ProprietaryRestricted
Weights
Not released
Code
Unknown
Training
Pretrained
Created by
xAI

Developer of the Grok models

San Francisco, California, United States
Founded 2023
Website
Pricing

No tracked provider pricing is available yet.

This model is deprecated. xAI recommends switching to Grok 4.7.

About

Grok 4 Fast Non-Reasoning is a September 2025 xAI model retiring on 2026-05-15; use Grok 4.3 for current API work.

Providers

No active provider routes are tracked for this model.

Deprecated provider routes(3)

ProviderStatusCatalog ID
Microsoft Foundry
DeprecatedRetired May 1, 2026
—
xAI Console
DeprecatedRetired May 15, 2026
grok-4-fast-non-reasoning
Inceptron
Deprecated
—

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 500+ models from 80+ providers via a single OpenAI-compatible API, with an optional Auto Router that selects a model per prompt from market spend data.

Passthrough + feexAI Console

Portkey

Gateway

Production AI gateway routing to 1,600+ LLMs with failover, load balancing, caching, and guardrails; MIT-licensed open-source core is self-hostable. Now part of Palo Alto Networks as Prisma AIRS AI Gateway.

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.

Passthrough + feeMicrosoft Foundry

Helicone

Gateway

Observability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache-2.0 open-source platform 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

VisionMultimodalReasoning

Benchmark peer barsfor Long context

No task-mapped benchmark peers are available for this model yet.

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.
BenchmarkScoreVersionEvaluationSource
LMArena Text Arena - Creative Writing
1386.0text creative_writing 2026-10-22Observed 2026-10-22
Configuration: Grok 4 Fast (Non-Reasoning)
Harness: LMArena blind pairwise human votes, Bradley-Terry
Evaluator: LMArena
Confidence: confirmed
Notes: LMArena Text arena, Creative Writing category (no style control), board published 2026-10-22 (HF lmarena-ai/leaderboard-dataset @a467e6b9, text config, latest split). Board entry 'Grok 4 Fast (Non-Reasoning)' (category creative_writing in text/latest-00000-of-00001.parquet): rank 125 of 416, rating 1386.3 (95% CI 1366.3-1406.2), 889 votes. LLM Reference model is lifecycle-deprecated; score kept as historical. Source: LMArena (CC BY 4.0). Retrieved 2026-10-27.
Source

Source: LMArena (lmarena.ai), CC BY 4.0

Migration checks

No linked migration route is available for this model yet.