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Favicon for x-ai

SpaceXAI: Grok 4.20

x-ai/grok-4.20

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Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.

Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docsOpens in new tab

Modalities
In / Out Price
$1.25 / $2.50per 1M
Context
2.0M
Released
Mar 31, 2026
Knowledge Cutoff
Sep 2025
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for SpaceXAI: Grok 4.20 (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) GPQA Diamond78.5%
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) HLE24.5%
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) IFBench47.8%
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) τ²-Bench Telecom69.6%
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) AA-LCR25.3%
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) CritPt0.0%
Artificial AnalysisGrok 4.20 0309 (Non-reasoning) Terminal-Bench Hard22.0%
Artificial AnalysisGrok 4.20 0309 (Reasoning) GPQA Diamond88.5%
Artificial AnalysisGrok 4.20 0309 (Reasoning) HLE32.4%
Artificial AnalysisGrok 4.20 0309 (Reasoning) IFBench82.9%
Artificial AnalysisGrok 4.20 0309 (Reasoning) τ²-Bench Telecom96.5%
Artificial AnalysisGrok 4.20 0309 (Reasoning) AA-LCR67.7%
Artificial AnalysisGrok 4.20 0309 (Reasoning) CritPt6.0%
Artificial AnalysisGrok 4.20 0309 (Reasoning) Terminal-Bench Hard40.9%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) GPQA Diamond77.6%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) HLE27.9%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) IFBench49.3%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) τ²-Bench Telecom59.9%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) AA-LCR23.3%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) CritPt0.3%
Artificial AnalysisGrok 4.20 0309 v2 (Non-reasoning) Terminal-Bench Hard16.7%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) GPQA Diamond91.1%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) HLE34.5%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) IFBench81.2%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) τ²-Bench Telecom93.0%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) AA-LCR69.0%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) CritPt6.6%
Artificial AnalysisGrok 4.20 0309 v2 (Reasoning) Terminal-Bench Hard37.9%
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena 3D Elo1190
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena Asciiart Elo1172
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena Code Categories Elo1219
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena Data Visualization Elo1217
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena Game Development Elo1191
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena SVG Elo1161
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena UI Component Elo1194
Design ArenaGrok 4.20 Beta (Reasoning) Models Arena Website Elo1228

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

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P50, best across providers

Latency
0.59s

P50, best provider

Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.96%

Availability over the last 3 days

Last 72 hours
Availability 99.96%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.95%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

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Frequently asked questions

Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses. Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs

Grok 4.20 costs $1.25/M input tokens and $2.50/M output tokens, with separate rates for Cache Read at $0.20/M tokens and Web Search at $5.00/1K calls.

Grok 4.20 has a 2,000,000 token context window.

Yes. Grok 4.20 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Grok 4.20 accepts text, images, and files such as PDFs as input and returns text.

Grok 4.7, Grok 4.6, Grok 4.5 and 3 more are other text models from SpaceXAI.

Grok 4.20 was released on March 31, 2026. Its knowledge cutoff is September 1, 2025.