Model comparison
Claude Sonnet 5.5 vs Grok Build 0.1
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 35.8 on the Noometry Index. Grok Build 0.1 costs 3.2× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 3 categories and Grok Build 0.1 in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in coding, where Claude Sonnet 5.5 leads 65.5 to 42.5.
- The biggest single-benchmark swing is CritPt: 31.4% for Claude Sonnet 5.5 and 9.1% for Grok Build 0.1.
- Grok Build 0.1 is cheaper at $1 / $2 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 256K.
Side by side
| Claude Sonnet 5.5 | Grok Build 0.1 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 60.5 | 35.8 |
| Released | 2026-09-28 | 2026-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 256K |
| Max output | 128K | 256K |
| Input $ / M tokens | $2 | $1 |
| Output $ / M tokens | $10 | $2 |
| Results tracked | 16 | 3 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 65.5 (#6), Grok Build 0.1: 42.5 (#90)
| Benchmark | Claude Sonnet 5.5 | Grok Build 0.1 |
|---|---|---|
| SciCode | 61% | 50.2% |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 44.9 (#14), Grok Build 0.1: 22.5 (#122)
| Benchmark | Claude Sonnet 5.5 | Grok Build 0.1 |
|---|---|---|
| APEX-Agents | 75.5% | — |
| GBAEval | — | 2.4% |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 52.4 (#29), Grok Build 0.1: 31.3 (#73)
| Benchmark | Claude Sonnet 5.5 | Grok Build 0.1 |
|---|---|---|
| CritPt | 31.4% | 9.1% |
| Mystery Game Puzzles | 65% | — |
Math Not comparable
Claude Sonnet 5.5: 88.7 (#4), Grok Build 0.1: —
| Benchmark | Claude Sonnet 5.5 | Grok Build 0.1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
Knowledge Not comparable
Claude Sonnet 5.5: 66.0 (#11), Grok Build 0.1: —
| Benchmark | Claude Sonnet 5.5 | Grok Build 0.1 |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Not comparable
Claude Sonnet 5.5: 53.2 (#5), Grok Build 0.1: —
| Benchmark | Claude Sonnet 5.5 | Grok Build 0.1 |
|---|---|---|
| Furniture Assembly | 75% | — |
Frequently asked questions
Is Claude Sonnet 5.5 better than Grok Build 0.1?
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 35.8 on the Noometry Index. Grok Build 0.1 costs 3.2× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.
Which is cheaper, Claude Sonnet 5.5 or Grok Build 0.1?
Grok Build 0.1 is cheaper. It lists at $1 per million input tokens and $2 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.
Is Claude Sonnet 5.5 or Grok Build 0.1 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 42.5 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 5.5 does, with 1M tokens against 256K.
How many benchmarks do Claude Sonnet 5.5 and Grok Build 0.1 share?
2 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Grok Build 0.1 has 3.