Grok 4.20 Reasoning
Grok 4.20 Reasoning 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 2 tracked provider routes
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- Grok 4
- Released
- 2026-03-10
- Context
- 1m
- Knowledge cutoff
- 2024-11
- Specialization
- reasoning
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
Cheapest of 2 routes · Vercel AI Gateway · cache read $0.200
About
Grok 4.20 Reasoning is the xAI API reasoning variant launched around March 10, 2026 as grok-4.20-0309-reasoning. The prior May 2026 seed date was a placeholder; this model was already available months earlier and remains active.
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 2Compare API pricing across 2 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Batch in / out | Cache | Route |
|---|---|---|---|---|---|
| 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(1)
Capabilities
Benchmark peer barsfor RAG
No task-mapped benchmark peers are available for this model yet.
Benchmark scores(2)
| Benchmark | Score | Version | Evaluation | Source |
|---|---|---|---|---|
| Google-Proof Q&A | 88.5 | GPQA Diamond (accuracy)Observed 2026-06-07 | — | Source |
| Humanity's Last Exam | 30.0 | HLE for Grok 4 (accuracy)Observed 2026-06-07 | — | Source |
Migration checks
No linked migration route is available for this model yet.
Cheapest of 2 routes · Vercel AI Gateway · cache read $0.200