Grok 4.20 (0309) Reasoning API Pricing
Grok 4.20 0309 Reasoning is a dated SpaceXSI (formerly xAI) reasoning snapshot at $1.25/$2.50. $1.25/M input, $2.5/M output, and $0.2/M cached input. It is useful for comparing Grok dated variants against the current Grok 4.3 line.
Grok 4.20 (0309) Reasoning API cost calculator.
Calculator pre-loaded with Grok 4.20 (0309) Reasoning rates. Tweak spend, output mix, or cache hit rate to compare this model with current alternatives.
Grok 4.20 (0309) Reasoning cost on real workloads.
Repo-wide bug fix
Reading 100-page contracts
Support agent ticket triage
Research planning turn
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Grok 4.20 (0309) Reasoning Current | $1.25 cache $0.20 | $2.50 | $0.558 agentic 92/8 | 1M | Grok long-context agents |
| Grok 4.3 | $1.25 cache $0.20 | $2.50 | $0.558 same | 1M | Grok long-context agents |
| GPT-6.1 Sol | $2.00 cache $0.10 | $10.00 | $1.29 +2.3× | 1.05M | OpenAI's balanced model for coding and agents |
| Claude Sonnet 5.5 | $2.00 cache $0.10 | $10.00 | $1.29 +2.3× | 1M | Anthropic's current Sonnet |
| Gemini 3.8 Flash | $0.75 cache $0.075 | $3.75 | $0.481 −14% · promo | 1M | Gemini multimodal workloads |
Grok 4.20 (0309) Reasoning has published scores on 2 benchmarks we track; its best placing is #30 of 105 on ARC-AGI-2. All of these scores come from independent leaderboards, not from the lab.
| Benchmark | Score | Rank | Leader | Source |
|---|---|---|---|---|
| ARC-AGI-2 Reasoning | 65.1% ARC Prize verified, best result | #30 of 105 | GPT-6 Astra · 95% | Official leaderboard ARC Prize Foundation |
| ARC-AGI-1 Reasoning | 89.5% ARC Prize verified, best result | #34 of 99 | 6 tied · 98.5% | Official leaderboard ARC Prize Foundation |
Grok 4.20 (0309) Reasoning API pricing FAQ.
Short answers for teams checking Grok 4.20 (0309) Reasoning pricing, status, and migration choices.
Q · 01 Is Grok 4.20 (0309) Reasoning still available? +
Q · 02 How much does Grok 4.20 (0309) Reasoning cost? +
Q · 03 Is cached-input pricing included? +
Q · 04 What should teams compare it against? +
current same-provider models.