Grok 4 Models by xAI
xAIProprietary
xAI releases · 18 in the last 12 months · this family litChangelog →
15 models2025–2026Up to 2M ctxFrom $0.200/1M input
Last refreshed 2026-09-21. Next refresh: weekly.
Details
ResearcherxAI
LicenseProprietary
Commercial useCommercial use: conditional
Models15
Released2025–2026
Max context2M
Capabilities
Vision14 of 15 models
Multimodal14 of 15 models
Reasoning12 of 15 models
JSON / Tool use12 of 15 models
Structured Outputs10 of 15 models
Code Execution4 of 15 models
About
xAI's Grok 4 model family spans the original Grok 4 API lineup, Grok 4.3, Grok 4.20 variants, and Grok 4.5 — the July 2026 flagship for coding, agentic tasks, and knowledge work.
Decision facts
- Best fit
- agenticreasoningvision and multimodal work
- Capability starting point
- Grok 4.6 with 500K context and reasoning, JSON / Tool use, structured outputs, and multimodal inputs
- Lowest tracked input
- Grok 4.1 Fast · $0.200/1M · OpenRouter
- Closest related family
- Grok 1
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
10 in view5 retired
Grok 4.7Current
Use when the workload needs 500K context, reasoning, and JSON / Tool use.
2026-09500K contextreasoningJSON / Tool use
Grok 4.6Current
Use when the workload needs 500K context, reasoning, and JSON / Tool use.
2026-08500K contextreasoningJSON / Tool use
Grok 4.5Current
Use when the workload needs code, 500K context, and reasoning.
2026-07code500K contextreasoning
Grok 4.3Current
Use when the workload needs 1M context, reasoning, and JSON / Tool use.
2026-051M contextreasoningJSON / Tool use
Grok 4.20 Multi-AgentCurrent
Use when the workload needs agentic, 1M context, and reasoning.
2026-03agentic1M contextreasoning
Grok 4.20 Non-ReasoningCurrent
Use when the workload needs 1M context, JSON / Tool use, and structured outputs.
2026-031M contextJSON / Tool usestructured outputs
Grok 4.20 ReasoningCurrent
Use when the workload needs reasoning, 1M context, and JSON / Tool use.
2026-03reasoning1M contextJSON / Tool use
Grok 4.20Current
Use when the workload needs 1M context, reasoning, and JSON / Tool use.
2026-021M contextreasoningJSON / Tool use
Grok 4.1Current
Use when the workload needs 128K context, reasoning, and JSON / Tool use.
2025-11128K contextreasoningJSON / Tool use
Grok 4 HeavyCurrent
Use when the workload needs 256K context and multimodal inputs.
2025-07256K contextmultimodal inputs
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| Grok 4.7 | Use when the workload needs 500K context, reasoning, and JSON / Tool use. | 2026-09 | 500K contextreasoningJSON / Tool use | Current |
| Grok 4.6 | Use when the workload needs 500K context, reasoning, and JSON / Tool use. | 2026-08 | 500K contextreasoningJSON / Tool use | Current |
| Grok 4.5 | Use when the workload needs code, 500K context, and reasoning. | 2026-07 | code500K contextreasoning | Current |
| Grok 4.3 | Use when the workload needs 1M context, reasoning, and JSON / Tool use. | 2026-05 | 1M contextreasoningJSON / Tool use | Current |
| Grok 4.20 Multi-Agent | Use when the workload needs agentic, 1M context, and reasoning. | 2026-03 | agentic1M contextreasoning | Current |
| Grok 4.20 Non-Reasoning | Use when the workload needs 1M context, JSON / Tool use, and structured outputs. | 2026-03 | 1M contextJSON / Tool usestructured outputs | Current |
| Grok 4.20 Reasoning | Use when the workload needs reasoning, 1M context, and JSON / Tool use. | 2026-03 | reasoning1M contextJSON / Tool use | Current |
| Grok 4.20 | Use when the workload needs 1M context, reasoning, and JSON / Tool use. | 2026-02 | 1M contextreasoningJSON / Tool use | Current |
| Grok 4.1 | Use when the workload needs 128K context, reasoning, and JSON / Tool use. | 2025-11 | 128K contextreasoningJSON / Tool use | Current |
| Grok 4 Heavy | Use when the workload needs 256K context and multimodal inputs. | 2025-07 | 256K contextmultimodal inputs | Current |
Release Timeline
10 release groups2026-09
1 current
Grok 4.7
Current500K contextreasoningJSON / Tool use
2026-08
1 current
Grok 4.6
Current500K contextreasoningJSON / Tool use
2026-07
1 current
Grok 4.5
Currentcode500K contextreasoning
2026-05
1 current
Grok 4.3
Current1M contextreasoningJSON / Tool use
2026-03
3 current
Grok 4.20 Multi-Agent
Currentagentic1M contextreasoning
Grok 4.20 Non-Reasoning
Current1M contextJSON / Tool usestructured outputs
Grok 4.20 Reasoning
Currentreasoning1M contextJSON / Tool use
2026-02
1 current
Grok 4.20
Current1M contextreasoningJSON / Tool use
2025-11
1 current · 1 retired
Grok 4.1
Current128K contextreasoningJSON / Tool use
Grok 4.1 Fast
Replaced2M contextreasoningJSON / Tool use
2025-09
2 retired
Grok 4 Fast Non-Reasoning
Replaced2M contextreasoningmultimodal inputs
Grok 4 Fast Reasoning
Replaced2M contextreasoningmultimodal inputs
Replaced By
Replaced
Keep for legacy integrations; evaluate Grok 4.3 before new work.
Keep for legacy integrations; evaluate Grok 4.3 before new work.
Replaced
Keep for legacy integrations; evaluate Grok 4.3 before new work.
Replaced
Keep for legacy integrations; evaluate Grok Build 0.1 before new work.
Specifications(15 models)
| Model | Released | Context | Parameters | Vision | Multimodal | Reasoning | JSON / Tool use | Structured Outputs | Code Exec |
|---|---|---|---|---|---|---|---|---|---|
| Grok 4.7 | 2026-09 | 500K | — | Yes | Yes | Yes | Yes | Yes | Yes |
| Grok 4.6 | 2026-08 | 500K | — | Yes | Yes | Yes | Yes | Yes | Yes |
| Grok 4.5 | 2026-07 | 500K | — | Yes | Yes | Yes | Yes | No | Yes |
| Grok 4.3 | 2026-05 | 1M | ~0.5T | Yes | Yes | Yes | Yes | Yes | No |
| Grok 4.20 Multi-Agent | 2026-03 | 1M | — | Yes | Yes | Yes | Yes | Yes | No |
| Grok 4.20 Non-Reasoning | 2026-03 | 1M | — | Yes | Yes | No | Yes | Yes | No |
| Grok 4.20 Reasoning | 2026-03 | 1M | — | Yes | Yes | Yes | Yes | Yes | No |
| Grok 4.20 | 2026-02 | 1M | — | Yes | Yes | Yes | Yes | Yes | No |
| Grok 4.1 | 2025-11 | 128K | — | Yes | Yes | Yes | Yes | No | No |
| Grok 4 Heavy | 2025-07 | 256K | — | Yes | Yes | No | No | No | No |
Available From(7 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| Grok 4.20 Multi-Agent | OpenRouter | $1.25 | $2.5 | Serverless |
| Grok 4.20 | xAI Console | $1.25 | $2.5 | Serverless |
| Grok 4.3 | xAI Console | $1.25 | $2.5 | Serverless |
| Grok 4.20 Multi-Agent | xAI Console | $1.25 | $2.5 | Serverless |
| Grok 4.3 | OpenRouter | $1.25 | $2.5 | Serverless |
| Grok 4.20 | OpenRouter | $1.25 | $2.5 | Serverless |
| Grok 4.20 Reasoning | xAI Console | $1.25 | $2.5 | Serverless |
| Grok 4.20 Non-Reasoning | xAI Console | $1.25 | $2.5 | Serverless |
| Grok 4.20 Multi-Agent | Vercel AI Gateway | $1.25 | $2.5 | Serverless |
| Grok 4.20 Non-Reasoning | Vercel AI Gateway | $1.25 | $2.5 | Serverless |
| Grok 4.20 Reasoning | Vercel AI Gateway | $1.25 | $2.5 | Serverless |
| Grok 4.3 | Vercel AI Gateway | $1.25 | $2.5 | Serverless |
| Grok 4.3 | AWS Bedrock | $1.25 | $2.5 | Serverless |
| Grok 4.5 | xAI Console | $2 | $6 | Serverless |
| Grok 4.5 | OpenRouter | $2 | $6 | Serverless |
| Grok 4.5 | Vercel AI Gateway | $2 | $6 | Serverless |
| Grok 4.6 | xAI Console | $2 | $6 | Serverless |
| Grok 4.6 | OpenRouter | $2 | $6 | Serverless |
| Grok 4.7 | xAI Console | $2 | $6 | Serverless |
| Grok 4.7 | OpenRouter | $2 | $6 | Serverless |
Popular comparisons in this family
Comparisons
- GPT-4o (08-06) vs Grok 4
- o3 vs Grok 4
- Grok 4 Fast Reasoning vs o3
- Grok 4.3 vs GPT-5.5
- Claude Sonnet 4.6 vs Grok 4
- Claude Opus 4.6 vs Grok 4
- Grok 4 Fast Reasoning vs Claude Opus 4.6
- Claude Fable 5 vs Grok 4
Related Model Families
Models(15)
Grok 4.7
2026-09500K2 providers
MultimodalReasoning
Grok 4.6
2026-08500K2 providers
MultimodalReasoning
Grok 4.5
2026-07500K3 providers
MultimodalReasoning
Grok 4.3
2026-051M~0.5T5 providers
MultimodalReasoning
Grok 4.20 Multi-Agent
2026-031M3 providers
MultimodalReasoning
Grok 4.20 Non-Reasoning
2026-031M2 providers
Multimodal
Grok 4.20 Reasoning
2026-031M2 providers
MultimodalReasoning
Grok 4.20
2026-021M2 providers
MultimodalReasoning
Grok 4.1
2025-11128K
MultimodalReasoning
Grok 4 Heavy
2025-07256K
Multimodal