What is Grok 4.20 Reasoning?
Grok 4.20 Reasoning is a language model in the o10 fulfillment catalog (slug: grok-4.20-reasoning). Published input pricing starts at $1.25/1M tokens. Context window: 2M tokens.
Catalog snapshot 2026-06-27.
Grok 4.20 Reasoning costs $1.25/1M input tokens and $2.50/1M output tokens as of 2026-06-27. Openrouter publishes this model with a 2M tokens context window. o10 lists Grok 4.20 Reasoning on xAI at routing band C4.
Last updated: 2026-06-27. Full catalog
Grok 4.20 Reasoning — specs, hosts, and routing
AnswersSelf-contained
How much does Grok 4.20 Reasoning cost per million tokens?
Grok 4.20 Reasoning costs $1.25/1M input tokens and $2.50/1M output tokens in the gateway catalog snapshot (2026-06-27). Endpoint pricing may differ by fulfillment host.
Sourced from gateway catalog snapshot.
Where can you run Grok 4.20 Reasoning?
Grok 4.20 Reasoning is configured on xAI. Each host maps to an upstream model ID listed in the fulfillment routes table. This model is routable through o10 eval-gated routing.
What is Grok 4.20 Reasoning's context window?
Grok 4.20 Reasoning supports a 2M tokens context window in the gateway catalog snapshot. Context limits may vary by fulfillment host endpoint.
What o10 routing band is Grok 4.20 Reasoning?
Grok 4.20 Reasoning is classified at o10 routing band C4. Bands group models by cost tier and eval profile: C0 (economy), C1 (standard), C2 (capable), C3/C4 (frontier). Production routing is enabled for this slug.
Who makes Grok 4.20 Reasoning?
Grok 4.20 Reasoning is attributed to source provider openrouter in the o10 catalog. Fulfillment hosts (xAI) supply API access; list pricing may differ by venue.
01Deep dive
Specifications
Grok 4.20 Reasoning in the o10 unified catalog.
| Field | Value |
|---|---|
| o10 slug | `grok-4.20-reasoning` |
| Type | text |
| Band | C4 |
| Routable | Yes |
| Source provider | openrouter |
| Primary host | xAI |
| Gateway ID | `xai/grok-4.20-reasoning` |
| Context window | 2,000,000 tokens |
| Released | 2026-03-09 |
02Deep dive
Token pricing
Gateway snapshot pricing for Grok 4.20 Reasoning.
| Unit | Price |
|---|---|
| Input | $1.25/1M tokens |
| Output | $2.5/1M tokens |
03Deep dive
Fulfillment hosts
Upstream venues configured for Grok 4.20 Reasoning.
| Host | Upstream model ID |
|---|---|
| xai | xai/grok-4.20-reasoning |
04Deep dive
Gateway provider endpoints
Endpoint-level pricing and latency from the gateway catalog.
| Provider | Input ($/1M) | Latency p50 | Uptime 1d |
|---|---|---|---|
| vertex | $2 | 888ms | 10000.0% |
| xai | $1.25 | 380ms | 10000.0% |
05Deep dive
Routing with o10
Eval-gated model selection for this slug.
o10 slug: grok-4.20-reasoning. Band: C4. Routable: yes.
See [/models/routing](/models/routing) for smart aliases (o10/auto, o10/economy) and [/kyi](/kyi) for governance.
SourceMethodology
Fulfillment catalog 2026-06-27. Gateway pricing joined where slug match exists.
FAQFrequently asked questions
Common questions
How much does Grok 4.20 Reasoning cost?
Grok 4.20 Reasoning costs $1.25/1M input tokens and $2.50/1M output tokens in the gateway snapshot (2026-06-27). Verify against your provider's published pricing.
What is Grok 4.20 Reasoning's context window?
Grok 4.20 Reasoning supports 2M tokens in the gateway catalog snapshot. Host-specific endpoints may differ.
Which hosts serve Grok 4.20 Reasoning?
Grok 4.20 Reasoning (grok-4.20-reasoning) is configured on: xAI. Upstream model IDs are listed in the fulfillment routes section.
Is Grok 4.20 Reasoning routable through o10?
Yes. Grok 4.20 Reasoning is routable at band C4. Send model: "grok-4.20-reasoning" or use an o10 smart routing alias.
How do I call Grok 4.20 Reasoning via o10?
Use o10 slug "grok-4.20-reasoning" or gateway ID "xai/grok-4.20-reasoning" depending on your integration. Gateway-compatible endpoints accept OpenAI-style /v1 requests.
How does o10 route this model?
o10 routes Grok 4.20 Reasoning only when per-use-case evals clear at your quality floor. Band C4 indicates cost tier. See /kyi for governance and /models/routing for smart aliases.