Grok 4.3
Grok 4.3 is worth evaluating for rag, agents, and long context when its provider route and context window match the workload.
Use it for
- Teams evaluating rag, agents, and long context
- Workloads that can use a 1m context window
- Buyers comparing 4 tracked provider routes
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- Grok 4
- Released
- 2026-05-06
- Context
- 1m
- Parameters
- ~0.5T
- Knowledge cutoff
- 2024-11
- Specialization
- general
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
- Training
- Pretrained
Cheapest of 5 routes · AWS Bedrock · cache read $0.200
About
xAI's Grok 4.3 is the current flagship API chat model for agentic tool calling and instruction following. xAI lists text and image input, text output, configurable reasoning, a 1,000,000 token context window, cached-input pricing, function calling, and structured outputs.
Grok 4.3 is a proprietary model in the Grok 4 family. The structured metadata tracks a 1m-token context window, multimodal input, reasoning, function calling, tool use, and structured outputs. This page tracks provider routes through xAI Console, OpenRouter, Microsoft Foundry, and 2 more, with the cheapest tracked route listed at $1.25 input and $2.5 output per 1M tokens. Headline tracked benchmarks include Google-Proof Q&A 90.1 and GeneBench-Pro 1.5.
Top use-case fit: coding, agents, and build tasks
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Long context
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare all 5Compare API pricing across 4 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Batch in / out | Cache | Route |
|---|---|---|---|---|---|
| AWS Bedrock | $1.25 | $2.50 | - | read $0.200 | Serverless |
| OpenRouter | $1.25 | $2.50 | - | read $0.200 | Serverless |
| Vercel AI Gateway | $1.25 | $2.50 | - | read $0.200 | Serverless |
| xAI Console | $1.25 | $2.50 | $1.00 / $2.00 | read $0.200 | Serverless |
Available via routers & gateways(7)
LiteLLM
GatewayOpen-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.
OpenRouter
HybridUnified 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.
Portkey
GatewayProduction 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.
Amazon Bedrock Intelligent Prompt Routing
RouterAWS Bedrock's native intelligent prompt router that routes prompts between Anthropic Claude model tiers (Haiku/Sonnet) based on predicted task complexity, with no extra per-routing charge.
Azure AI Foundry Model Router
RouterMicrosoft 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.
Helicone
GatewayObservability-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.
Capabilities
Benchmark peer barsfor RAG
No task-mapped benchmark peers are available for this model yet.
Benchmark scores(2)
| Benchmark | Score | Version | Source |
|---|---|---|---|
| Google-Proof Q&A | 90.1 | — | https://x.ai/blog/grok-4-3 |
| GeneBench-Pro | 1.5 | high | https://cdn.openai.com/pdf/21938268-21af-442f-af93-3b2249afb241/genebench-pro.pdf |
Migration checks
No linked migration route is available for this model yet.
Rankings & picks(3)
Compare Grok 4.3 with other models
Comparison and alternatives
Browse all comparisons →Show all 32 popular comparisonssorted by 7-day search impressions
Frequently asked questions
What is the context window of Grok 4.3?
Grok 4.3 has a context window of 1m tokens.
How much does Grok 4.3 cost?
Grok 4.3 is available at $1.25/1M input tokens through xAI Console.
When was Grok 4.3 released?
Grok 4.3 was released on 2026-05-06.
Which providers offer Grok 4.3?
Grok 4.3 is available from 5 providers: xAI Console, OpenRouter, Microsoft Foundry, Vercel AI Gateway, AWS Bedrock.
What benchmarks has Grok 4.3 been tested on?
Grok 4.3 has been evaluated on 2 benchmarks, including Google-Proof Q&A, GeneBench-Pro.
Cheapest of 5 routes · AWS Bedrock · cache read $0.200