Grok 4.20 vs Grok 4.5
Grok 4.20 (xAI) and Grok 4.5 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Grok 4.5 leads on overall intelligence (ECI 154 vs 153).
- Grok 4.20 is cheaper on input tokens — $1.25 vs $2.00 per 1M.
- Grok 4.20 has a larger context window (2M vs 500K tokens).
- Grok 4.5 ranks higher for coding (91th vs 55th percentile).
| Attribute | Grok 4.20 | Grok 4.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 153 | 154 |
| Coding | 55 | 91 |
| Math | 65 | 85 |
| Reasoning & Knowledge | 58 | 70 |
| Agentic & Tools | 65 | 75 |
| Specifications | ||
| Developer | xAI | xAI |
| Family | Grok | Grok |
| Released | Feb 17, 2026 | Jul 8, 2026 |
| Parameters | 500B | — |
| Availability | API access | API access |
| Context window | 2M | 500K |
| Price — $/M input | $1.25 | $2.00 |
| Price — $/M output | $2.50 | $6.00 |
| Inputs | text, image, file | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 92% | 98% |
| ARC-AGI | 90% | 87% |
| ARC-AGI-2 | 65% | 53% |
| GPQA Diamond | 89% | 93% |
| SimpleQA Verified | 35% | 54% |
| Terminal-Bench | 57% | — |
| WebDev Arena | 1395 | 1551 |
| WeirdML | 52% | 46% |
| APEX | — | 34% |
| Humanity's Last Exam | — | 40% |
| SciCode | — | 54% |
| SimpleBench | — | 70% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Grok 4.20 better than Grok 4.5?
On Epoch AI's Capabilities Index, Grok 4.5 scores higher (154) than Grok 4.20 (153). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Grok 4.20 or Grok 4.5?
Grok 4.20 is cheaper on input tokens at $1.25 per million, versus $2.00 (representative OpenRouter pricing).
Which has a larger context window, Grok 4.20 or Grok 4.5?
Grok 4.20 supports up to 2M tokens, compared with 500K for the other.
Which is better for coding, Grok 4.20 or Grok 4.5?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Grok 4.5 ranks higher — 91th vs 55th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.