Grok 4 Models by xAI
Last refreshed 2026-09-21. Next refresh: weekly.
Details
Capabilities
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 4.20 with 1m 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.
Use when the workload needs 500k context, reasoning, and JSON / Tool use.
Use when the workload needs 500k context, reasoning, and JSON / Tool use.
Use when the workload needs code, 500k context, and reasoning.
Use when the workload needs code, 256k context, and reasoning.
Use when the workload needs 1m context, reasoning, and JSON / Tool use.
Use when the workload needs agentic, 1m context, and reasoning.
Use when the workload needs 1m context, JSON / Tool use, and structured outputs.
Use when the workload needs reasoning, 1m context, and JSON / Tool use.
Use when the workload needs 1m context, reasoning, and JSON / Tool use.
Use when the workload needs 131k context, reasoning, and JSON / Tool use.
Use when the workload needs 256k context and multimodal 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 Build 0.1 | Use when the workload needs code, 256k context, and reasoning. | 2026-05 | code256k 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 131k context, reasoning, and JSON / Tool use. | 2025-11 | 131k 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 groupsReplaced By
Keep for legacy integrations; evaluate Grok 4.3 before new work.
Keep for legacy integrations; evaluate Grok 4.3 before new work.
Keep for legacy integrations; evaluate Grok 4.3 before new work.
Keep for legacy integrations; evaluate Grok Build 0.1 before new work.
Specifications(16 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 Build 0.1 | 2026-05 | 256k | — | Yes | Yes | Yes | Yes | Yes | No |
| 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 | 131k | — | Yes | Yes | Yes | Yes | No | No |
| Grok 4 Heavy | 2025-07 | 256k | — | Yes | Yes | No | No | No | No |
Available From(7 providers)
Pricing
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(16)
Grok 4.7
Grok 4.6
Grok 4.5
Grok Build 0.1
Grok 4.3
Grok 4.20 Multi-Agent
Grok 4.20 Non-Reasoning
Grok 4.20 Reasoning
Grok 4.20
Grok 4.1
Grok 4 Heavy