Model comparison
Grok 4.20 vs Hy3 Preview
Head-to-head evidence from 4 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok 4.20 #88 (Estimated); Hy3 Preview unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4.20 and Hy3 Preview share 4 comparable benchmark results. 2 of 8 categories are comparable. 14 results are unique to Grok 4.20; 18 to Hy3 Preview.
Updated July 23, 2026- Shared results
- 4
- Grok 4.20 only
- 14
- Hy3 Preview only
- 18
- Comparable categories
- 2 / 8
Treat this as a split decision. Grok 4.20 makes more sense if coding is the priority or you need the larger 2M context window; Hy3 Preview is the better fit if agentic is the priority or you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 4 shared benchmark results across 3 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Grok 4.20 and Hy3 Preview finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Hy3 Preview. That is roughly Infinityx on output cost alone. Grok 4.20 gives you the larger context window at 2M, compared with 256K for Hy3 Preview.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Grok 4.20 | Δ | Hy3 Preview |
|---|---|---|---|
| Coding | Grok 4.2067.1 | Margin← 9.3 | Hy3 Preview57.8 |
| Agentic | Grok 4.2047.1 | Margin→ 7.3 | Hy3 Preview54.4 |
| Reasoning | Grok 4.2053.3 | MarginNo overlap | Hy3 PreviewNot measured |
| Knowledge | Grok 4.20Not measured | MarginNo overlap | Hy3 Preview33.8 |
| Multimodal | Grok 4.2070.1 | MarginNo overlap | Hy3 PreviewNot measured |
| Inst. Following | Grok 4.20Not measured | MarginNo overlap | Hy3 Preview63.1 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
Terminal-Bench 2.0
AgenticA 47.1%B 54.4%Winner: Hy3 PreviewΔ 7.3Terminal-Bench 2.0: Grok 4.20 scored 47.1%; Hy3 Preview scored 54.4%. Hy3 Preview wins this benchmark. - Source ↗
SWE-bench Verified
CodingA 76.7%B 74.4%Winner: Grok 4.20Δ 2.3SWE-bench Verified: Grok 4.20 scored 76.7%; Hy3 Preview scored 74.4%. Grok 4.20 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4.20 | Hy3 Preview | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4.20$2 input / $6 output | Hy3 Preview$0 input / $0 output | Hy3 Preview has the lower combined listed price. |
| Generation speedtokens per second | Grok 4.20233 tok/s | Hy3 PreviewNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok 4.2010.33 s | Hy3 PreviewNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok 4.202M | Hy3 Preview256K | Grok 4.20 lists the larger context window. |
Benchmark Deep Dive
AgenticHy3 Preview wins6 benchmarks
CodingGrok 4.20 wins8 benchmarks
| Benchmark | Grok 4.20 | Hy3 Preview | Result |
|---|---|---|---|
| LiveCodeBench ProSource | 74.2% | — | Not comparable |
| SWE-bench VerifiedSource | 76.7% | 74.4% | Grok 4.20 leads |
| SWE-bench ProSource | 51.8% | — | Not comparable |
| Vibe Code BenchSource | 4.06% | — | Not comparable |
| Terminal-Bench 2.0Source | — | 54.4% | Not comparable |
| SciCodeSource | — | 41.2% | Not comparable |
| AA-SciCodeSource | — | 47.6% | Not comparable |
| AA Coding IndexSource | — | 58.8% | Not comparable |
Reasoning3 benchmarks
Knowledge12 benchmarks
| Benchmark | Grok 4.20 | Hy3 Preview | Result |
|---|---|---|---|
| GPQA-DSource | 88.5% | 87.2% | Grok 4.20 leads |
| HLE w/o toolsSource | 31.6% | — | Not comparable |
| HealthBench HardSource | 20.3% | — | Not comparable |
| MedXpertQA (Text)Source | 50.2% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 41.2% | Not comparable |
| GPQASource | — | 87.2% | Not comparable |
| HLESource | — | 25.5% | Not comparable |
| AA-Omniscience AccuracySource | — | 31.5% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 73.0% | Not comparable |
| AA-GPQA DiamondSource | — | 89.7% | Not comparable |
| AA-HLESource | — | 31.6% | Not comparable |
| AA-Omniscience IndexSource | — | -18.5% | Not comparable |
Multimodal6 benchmarks
Inst. Following1 benchmarks
| Benchmark | Grok 4.20 | Hy3 Preview | Result |
|---|---|---|---|
| IFBenchSource | — | 63.1% | Not comparable |
Frequently Asked Questions (3)
Which is better, Grok 4.20 or Hy3 Preview?
Grok 4.20 and Hy3 Preview are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for coding, Grok 4.20 or Hy3 Preview?
Grok 4.20 has the edge for coding in this comparison, averaging 67.1 versus 57.8. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Grok 4.20 or Hy3 Preview?
Hy3 Preview has the edge for agentic tasks in this comparison, averaging 54.4 versus 47.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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