Model comparison
Claude Haiku 4.5 vs Grok Code Fast 1
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Haiku 4.5 #77 (Estimated); Grok Code Fast 1 #180 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Haiku 4.5 and Grok Code Fast 1 share 1 comparable benchmark result. 1 of 8 categories are comparable. 4 results are unique to Claude Haiku 4.5; 11 to Grok Code Fast 1.
Updated July 20, 2026- Shared results
- 1
- Claude Haiku 4.5 only
- 4
- Grok Code Fast 1 only
- 11
- Comparable categories
- 1 / 8
Pick Claude Haiku 4.5 if you want the stronger benchmark profile. Grok Code Fast 1 only becomes the better choice if you want the cheaper token bill or you need the larger 256K context window.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Haiku 4.5 is clearly ahead on the BenchAlign aggregate, 56.58 to 38.64. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Haiku 4.5's sharpest advantage is in coding, where it averages 73.3 against 70.8. The single biggest benchmark swing on the page is SWE-bench Verified, 73.3% to 70.8%.
Claude Haiku 4.5 is also the more expensive model on tokens at $1.00 input / $5.00 output per 1M tokens, versus $0.20 input / $1.50 output per 1M tokens for Grok Code Fast 1. That is roughly 3.3x on output cost alone. Grok Code Fast 1 gives you the larger context window at 256K, compared with 200K for Claude Haiku 4.5.
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 | Claude Haiku 4.5 | Δ | Grok Code Fast 1 |
|---|---|---|---|
| Coding | Claude Haiku 4.573.3 | Margin← 2.5 | Grok Code Fast 170.8 |
| Math | Claude Haiku 4.54.9 | MarginNo overlap | Grok Code Fast 1Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 73.3%B 70.8%Winner: Claude Haiku 4.5Δ 2.5SWE-bench Verified: Claude Haiku 4.5 scored 73.3%; Grok Code Fast 1 scored 70.8%. Claude Haiku 4.5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Haiku 4.5 | Grok Code Fast 1 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Haiku 4.5$1 input / $5 output | Grok Code Fast 1$0.2 input / $1.5 output | Grok Code Fast 1 has the lower combined listed price. |
| Generation speedtokens per second | Claude Haiku 4.5Not available | Grok Code Fast 1172 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Haiku 4.5Not available | Grok Code Fast 12.81 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Haiku 4.5200K | Grok Code Fast 1256K | Grok Code Fast 1 lists the larger context window. |
Benchmark Deep Dive
Agentic2 benchmarks
CodingClaude Haiku 4.5 wins2 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Claude Haiku 4.5 | Grok Code Fast 1 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | — | 21.6% | Not comparable |
| AA-GPQA DiamondSource | — | 72.7% | Not comparable |
| AA-HLESource | — | 7.5% | Not comparable |
| AA-Omniscience IndexSource | — | -36.0% | Not comparable |
| AA-Omniscience AccuracySource | — | 23.8% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 78.5% | Not comparable |
Math2 benchmarks
Multimodal1 benchmarks
| Benchmark | Claude Haiku 4.5 | Grok Code Fast 1 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1154 | — | Not comparable |
Inst. Following1 benchmarks
| Benchmark | Claude Haiku 4.5 | Grok Code Fast 1 | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 41.4% | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude Haiku 4.5 or Grok Code Fast 1?
Claude Haiku 4.5 is ahead on BenchLM's BenchAlign leaderboard, 56.58 to 38.64. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 73.3% and 70.8%.
Which is better for coding, Claude Haiku 4.5 or Grok Code Fast 1?
Claude Haiku 4.5 has the edge for coding in this comparison, averaging 73.3 versus 70.8. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Related Comparisons
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.