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Model comparison

Claude Haiku 4.5 vs Claude Sonnet 4.6

Data verified

Head-to-head evidence from 5 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

56.58/100
Margin
8.5pts
winning →
65.07/100
1 category wins1 category wins

Public leaderboard positions: Claude Haiku 4.5 #77 (Estimated); Claude Sonnet 4.6 #32 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Haiku 4.5 and Claude Sonnet 4.6 share 5 comparable benchmark results. 2 of 8 categories are comparable. 0 results are unique to Claude Haiku 4.5; 28 to Claude Sonnet 4.6.

Updated July 20, 2026
Shared results
5
Claude Haiku 4.5 only
0
Claude Sonnet 4.6 only
28
Comparable categories
2 / 8

Pick Claude Sonnet 4.6 if you want the stronger benchmark profile. Claude Haiku 4.5 only becomes the better choice if coding is the priority or you want the cheaper token bill.

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 Sonnet 4.6 is clearly ahead on the BenchAlign aggregate, 65.07 to 56.58. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude Sonnet 4.6's sharpest advantage is in mathematics, where it averages 26.4 against 4.9. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 5.903% to 32.400%. Claude Haiku 4.5 does hit back in coding, so the answer changes if that is the part of the workload you care about most.

Claude Sonnet 4.6 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 scores and score margins for Claude Haiku 4.5 and Claude Sonnet 4.6
CategoryClaude Haiku 4.5ΔClaude Sonnet 4.6
MathClaude Haiku 4.54.9Margin→ 21.5Claude Sonnet 4.626.4
CodingClaude Haiku 4.573.3Margin← 4.2Claude Sonnet 4.669.1
AgenticClaude Haiku 4.5Not measuredMarginNo overlapClaude Sonnet 4.665.2
KnowledgeClaude Haiku 4.5Not measuredMarginNo overlapClaude Sonnet 4.666.0
MultimodalClaude Haiku 4.5Not measuredMarginNo overlapClaude Sonnet 4.677.4

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Haiku 4.5B · Claude Sonnet 4.6

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 5.903%B 32.400%
    Winner: Claude Sonnet 4.6Δ 26.5
    FrontierMath v2 (Tiers 1-3): Claude Haiku 4.5 scored 5.903%; Claude Sonnet 4.6 scored 32.400%. Claude Sonnet 4.6 wins this benchmark.

  2. SWE-bench Verified

    Coding
    Source ↗
    A 73.3%B 79.6%
    Winner: Claude Sonnet 4.6Δ 6.3
    SWE-bench Verified: Claude Haiku 4.5 scored 73.3%; Claude Sonnet 4.6 scored 79.6%. Claude Sonnet 4.6 wins this benchmark.

  3. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 2.083%B 8.300%
    Winner: Claude Sonnet 4.6Δ 6.2
    FrontierMath v2 (Tier 4): Claude Haiku 4.5 scored 2.083%; Claude Sonnet 4.6 scored 8.300%. Claude Sonnet 4.6 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Haiku 4.5Claude Sonnet 4.6Comparison
Input / output priceUSD per 1M tokensClaude Haiku 4.5$1 input / $5 outputClaude Sonnet 4.6$3 input / $15 outputClaude Haiku 4.5 has the lower combined listed price.
Generation speedtokens per secondClaude Haiku 4.5Not availableClaude Sonnet 4.644 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Haiku 4.5Not availableClaude Sonnet 4.61.48 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Haiku 4.5200KClaude Sonnet 4.6200KListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
JobBenchSource 16.0%36.9%Claude Sonnet 4.6 leads
Terminal-Bench 2.0Source —59.1%Not comparable
OSWorld-VerifiedSource —72.1%Not comparable
Claw-EvalSource —67.8%Not comparable
CyberGymSource —65.2%Not comparable
τ²-bench resultsSource —79.5%Not comparable
Gert LabsSource —62.92%Not comparable
OSWorld 2.0Source —8.3%Not comparable
CodingClaude Haiku 4.5 wins
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
SWE-bench VerifiedSource 73.3%79.6%Claude Sonnet 4.6 leads
SWE-RebenchSource —60.7%Not comparable
React Native EvalsSource —80.6%Not comparable
Vibe Code BenchSource —51.48%Not comparable
cursorBench31Source —48.8%Not comparable
AA-SciCodeSource —46.9%Not comparable
FrontierCode 1.1 MainSource —24.3%Not comparable
Reasoning
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
AA-LCRSource —57.7%Not comparable
CritPtSource —0.9%Not comparable
Knowledge
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
GPQASource —89.9%Not comparable
SuperGPQASource —95%Not comparable
MMLU-ProSource —79.2%Not comparable
HLESource —49%Not comparable
Artificial Analysis Intelligence IndexSource —35.9%Not comparable
AA-GPQA DiamondSource —79.9%Not comparable
AA-HLESource —13.2%Not comparable
AA-Omniscience IndexSource —-2.9%Not comparable
AA-Omniscience AccuracySource —38.0%Not comparable
AA-Omniscience Hallucination RateSource —65.9%Not comparable
MathClaude Sonnet 4.6 wins
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
FrontierMath v2 (Tiers 1-3)Source 5.903%32.400%Claude Sonnet 4.6 leads
FrontierMath v2 (Tier 4)Source 2.083%8.300%Claude Sonnet 4.6 leads
Multimodal
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
Design Arena WebsiteSource 11541317Claude Sonnet 4.6 leads
CharXivSource —77.4%Not comparable
AA-MMMU-ProSource —70.6%Not comparable
Inst. Following
BenchmarkClaude Haiku 4.5Claude Sonnet 4.6Result
AA-IFBenchSource —41.2%Not comparable
Frequently Asked Questions (3)

Which is better, Claude Haiku 4.5 or Claude Sonnet 4.6?

Claude Sonnet 4.6 is ahead on BenchLM's BenchAlign leaderboard, 65.07 to 56.58. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 5.903% and 32.400%.

Which is better for coding, Claude Haiku 4.5 or Claude Sonnet 4.6?

Claude Haiku 4.5 has the edge for coding in this comparison, averaging 73.3 versus 69.1. 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 4.6?

Claude Sonnet 4.6 has the edge for math in this comparison, averaging 26.4 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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