Model comparison
Claude Haiku 4.5 Thinking vs Claude Sonnet 4.5
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 Thinking unranked (Not scored); 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 Thinking and Claude Sonnet 4.5 share 1 comparable benchmark result. 0 of 8 categories are comparable. 1 result is unique to Claude Haiku 4.5 Thinking; 11 to Claude Sonnet 4.5.
Updated July 23, 2026- Shared results
- 1
- Claude Haiku 4.5 Thinking only
- 1
- Claude Sonnet 4.5 only
- 11
- Comparable categories
- 0 / 8
Benchmark data for Claude Haiku 4.5 Thinking and Claude Sonnet 4.5 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
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 Thinking | Δ | Claude Sonnet 4.5 |
|---|---|---|---|
| Agentic | Claude Haiku 4.5 ThinkingNot measured | MarginNo overlap | Claude Sonnet 4.555.4 |
| Coding | Claude Haiku 4.5 ThinkingNot measured | MarginNo overlap | Claude Sonnet 4.577.2 |
| Reasoning | Claude Haiku 4.5 ThinkingNot measured | MarginNo overlap | Claude Sonnet 4.513.6 |
| Knowledge | Claude Haiku 4.5 ThinkingNot measured | MarginNo overlap | Claude Sonnet 4.583.4 |
| Math | Claude Haiku 4.5 ThinkingNot measured | MarginNo overlap | Claude Sonnet 4.511.2 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Haiku 4.5 Thinking | Claude Sonnet 4.5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Haiku 4.5 ThinkingNot available | Claude Sonnet 4.5$3 input / $15 output | A complete price comparison is not available. |
| Generation speedtokens per second | Claude Haiku 4.5 ThinkingNot available | Claude Sonnet 4.5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Haiku 4.5 ThinkingNot available | Claude Sonnet 4.5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Haiku 4.5 Thinking200K | Claude Sonnet 4.5200K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding2 benchmarks
Reasoning1 benchmarks
| Benchmark | Claude Haiku 4.5 Thinking | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| ARC-AGI-2Source | — | 13.6% | Not comparable |
Knowledge1 benchmarks
| Benchmark | Claude Haiku 4.5 Thinking | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| GPQASource | — | 83.4% | Not comparable |
Math3 benchmarks
Multimodal1 benchmarks
| Benchmark | Claude Haiku 4.5 Thinking | Claude Sonnet 4.5 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1152 | 1219 | Claude Sonnet 4.5 leads |
Frequently Asked Questions (3)
Can I compare Claude Haiku 4.5 Thinking and Claude Sonnet 4.5 on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Claude Haiku 4.5 Thinking and Claude Sonnet 4.5 today?
Claude Sonnet 4.5: $3.00 input / $15.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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