Grok 4.20 0309 (Reasoning)
Analysis Summary
Grok 4.20 0309 Reasoning is a recent xAI reasoning variant with a measured intelligence result of 25.2 and listed input and output prices. That result is stronger than the older, lower-capability models in this batch, but it remains well below frontier-level results in the wider model field. The supplied record does not include coding, agentic, instruction-following, context, or speed measurements for this specific variant.
The listed pricing makes it a candidate for evaluation on reasoning-heavy tasks where quality and cost can be compared against alternatives. Without evidence for function calling, coding, or long-document handling, it should not be presumed suitable for autonomous agents or software engineering workflows. Pilot it on a defined task set before routing client work, and keep human review for consequential outputs.
Assessed September 23, 2026
Editorial notes
Grok 4.20 0309 Reasoning is a recent reasoning variant with listed API pricing, but this record does not establish coding, tool-use, or long-context strengths.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
Grok 4.20 0309 Reasoning is a recent reasoning variant with listed API pricing, but this record does not establish coding, tool-use, or long-context strengths.
Benchmarks
Artificial Analysis data refreshed Oct 18, 2026. Arena ratings from the Oct 13, 2026 text leaderboard, with style control.
Artificial Analysis has not published coding or agentic results for Grok 4.20 0309 (Reasoning) yet. Until it does, the model sits below tested models on the Coding and AI Agents lists.
How Grok 4.20 0309 (Reasoning) compares
Grok 4.20 0309 (Reasoning) ranks #87 of 439 AI models we track for overall intelligence. At $2.00 per million input tokens it is cheaper than 17% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $2.00 | $0.002000 |
| Output | $6.00 | $0.006000 |
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Frequently asked questions about Grok 4.20 0309 (Reasoning)
How much does Grok 4.20 0309 (Reasoning) cost?
Grok 4.20 0309 (Reasoning) costs $2.00 per million input tokens and $6.00 per million output tokens.
Who created Grok 4.20 0309 (Reasoning)?
Grok 4.20 0309 (Reasoning) is developed by xAI and was released on March 10, 2026.