Model comparison
Claude Haiku 4.5 vs Claude Sonnet 4.5
Head-to-head evidence from 5 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Haiku 4.5 #77 (Estimated); Claude Sonnet 4.5 #96 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Haiku 4.5 and Claude Sonnet 4.5 share 5 comparable benchmark results. 2 of 8 categories are comparable. 0 results are unique to Claude Haiku 4.5; 7 to Claude Sonnet 4.5.
Updated July 22, 2026- Shared results
- 5
- Claude Haiku 4.5 only
- 0
- Claude Sonnet 4.5 only
- 7
- Comparable categories
- 2 / 8
Pick Claude Haiku 4.5 if you want the stronger benchmark profile. Claude Sonnet 4.5 only becomes the better choice if mathematics is the priority.
Confidence note. This is a partial-evidence comparison with 5 shared benchmark results across 4 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
Claude Haiku 4.5 has the cleaner BenchAlign overall profile here, landing at 56.58 versus 53.61. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Claude Sonnet 4.5 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $1.00 input / $5.00 output per 1M tokens for Claude Haiku 4.5. That is roughly 3.0x on output cost alone.
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 | Claude Sonnet 4.5 |
|---|---|---|---|
| Math | Claude Haiku 4.54.9 | Margin→ 6.3 | Claude Sonnet 4.511.2 |
| Coding | Claude Haiku 4.573.3 | Margin→ 3.9 | Claude Sonnet 4.577.2 |
| Agentic | Claude Haiku 4.5Not measured | MarginNo overlap | Claude Sonnet 4.555.4 |
| Reasoning | Claude Haiku 4.5Not measured | MarginNo overlap | Claude Sonnet 4.513.6 |
| Knowledge | Claude Haiku 4.5Not measured | MarginNo overlap | Claude Sonnet 4.583.4 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 5.903%B 13.495%Winner: Claude Sonnet 4.5Δ 7.6FrontierMath v2 (Tiers 1-3): Claude Haiku 4.5 scored 5.903%; Claude Sonnet 4.5 scored 13.495%. Claude Sonnet 4.5 wins this benchmark. - Source ↗
SWE-bench Verified
CodingA 73.3%B 77.2%Winner: Claude Sonnet 4.5Δ 3.9SWE-bench Verified: Claude Haiku 4.5 scored 73.3%; Claude Sonnet 4.5 scored 77.2%. Claude Sonnet 4.5 wins this benchmark. - Source ↗
FrontierMath v2 (Tier 4)
MathA 2.083%B 4.167%Winner: Claude Sonnet 4.5Δ 2.1FrontierMath v2 (Tier 4): Claude Haiku 4.5 scored 2.083%; Claude Sonnet 4.5 scored 4.167%. Claude Sonnet 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 | Claude Sonnet 4.5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Haiku 4.5$1 input / $5 output | Claude Sonnet 4.5$3 input / $15 output | Claude Haiku 4.5 has the lower combined listed price. |
| Generation speedtokens per second | Claude Haiku 4.5Not available | Claude Sonnet 4.5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Haiku 4.5Not available | Claude Sonnet 4.5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Haiku 4.5200K | Claude Sonnet 4.5200K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
CodingClaude Sonnet 4.5 wins1 benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 73.3% | 77.2% | Claude Sonnet 4.5 leads |
Reasoning1 benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| ARC-AGI-2Source | — | 13.6% | Not comparable |
Knowledge1 benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| GPQASource | — | 83.4% | Not comparable |
MathClaude Sonnet 4.5 wins3 benchmarks
Multimodal1 benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1152 | 1219 | Claude Sonnet 4.5 leads |
Frequently Asked Questions (3)
Which is better, Claude Haiku 4.5 or Claude Sonnet 4.5?
Claude Haiku 4.5 is ahead on BenchLM's BenchAlign leaderboard, 56.58 to 53.61. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 5.903% and 13.495%.
Which is better for coding, Claude Haiku 4.5 or Claude Sonnet 4.5?
Claude Sonnet 4.5 has the edge for coding in this comparison, averaging 77.2 versus 73.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Which is better for math, Claude Haiku 4.5 or Claude Sonnet 4.5?
Claude Sonnet 4.5 has the edge for math in this comparison, averaging 11.2 versus 4.9. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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