What is Grok 4.1 Fast Reasoning?
Grok 4.1 Fast Reasoning is a language model in the o10 fulfillment catalog (slug: grok-4.1-fast-reasoning). Published input pricing starts at $0.200/1M tokens. Context window: 1M tokens.
Catalog snapshot 2026-06-27.
Grok 4.1 Fast Reasoning costs $0.200/1M input tokens and $0.500/1M output tokens as of 2026-06-27. Openrouter publishes this model with a 1M tokens context window. o10 lists Grok 4.1 Fast Reasoning on xAI at routing band C4.
Last updated: 2026-06-27. Full catalog
Grok 4.1 Fast Reasoning — specs, hosts, and routing
AnswersSelf-contained
How much does Grok 4.1 Fast Reasoning cost per million tokens?
Grok 4.1 Fast Reasoning costs $0.200/1M input tokens and $0.500/1M 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 4.1 Fast Reasoning?
Grok 4.1 Fast 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 4.1 Fast Reasoning's context window?
Grok 4.1 Fast Reasoning supports a 1M tokens context window in the gateway catalog snapshot. Context limits may vary by fulfillment host endpoint.
What o10 routing band is Grok 4.1 Fast Reasoning?
Grok 4.1 Fast 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 4.1 Fast Reasoning?
Grok 4.1 Fast 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 4.1 Fast Reasoning in the o10 unified catalog.
| Field | Value |
|---|---|
| o10 slug | `grok-4.1-fast-reasoning` |
| Type | text |
| Band | C4 |
| Routable | Yes |
| Source provider | openrouter |
| Primary host | xAI |
| Gateway ID | `xai/grok-4.1-fast-reasoning` |
| Context window | 1,000,000 tokens |
| Released | 2025-07-09 |
02Deep dive
Token pricing
Gateway snapshot pricing for Grok 4.1 Fast Reasoning.
| Unit | Price |
|---|---|
| Input | $0.2/1M tokens |
| Output | $0.5/1M tokens |
03Deep dive
Fulfillment hosts
Upstream venues configured for Grok 4.1 Fast Reasoning.
| Host | Upstream model ID |
|---|---|
| xai | xai/grok-4.1-fast-reasoning |
04Deep dive
Gateway provider endpoints
Endpoint-level pricing and latency from the gateway catalog.
| Provider | Input ($/1M) | Latency p50 | Uptime 1d |
|---|---|---|---|
| vertex | $0.2 | 3333ms | 9999.8% |
05Deep dive
Routing with o10
Eval-gated model selection for this slug.
o10 slug: grok-4.1-fast-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 4.1 Fast Reasoning cost?
Grok 4.1 Fast Reasoning costs $0.200/1M input tokens and $0.500/1M output tokens in the gateway snapshot (2026-06-27). Verify against your provider's published pricing.
What is Grok 4.1 Fast Reasoning's context window?
Grok 4.1 Fast Reasoning supports 1M tokens in the gateway catalog snapshot. Host-specific endpoints may differ.
Which hosts serve Grok 4.1 Fast Reasoning?
Grok 4.1 Fast Reasoning (grok-4.1-fast-reasoning) is configured on: xAI. Upstream model IDs are listed in the fulfillment routes section.
Is Grok 4.1 Fast Reasoning routable through o10?
Yes. Grok 4.1 Fast Reasoning is routable at band C4. Send model: "grok-4.1-fast-reasoning" or use an o10 smart routing alias.
How do I call Grok 4.1 Fast Reasoning via o10?
Use o10 slug "grok-4.1-fast-reasoning" or gateway ID "xai/grok-4.1-fast-reasoning" depending on your integration. Gateway-compatible endpoints accept OpenAI-style /v1 requests.
How does o10 route this model?
o10 routes Grok 4.1 Fast 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.