Claude Haiku 4.5 vs Claude Sonnet 5
Pricing, benchmarks, and use case comparison
Quick take
- •Claude Sonnet 5 leads on 1 of 1 shared benchmarks, including SWE-bench Verified (~85.2% vs 73.3%).
- •Claude Haiku 4.5 is meaningfully stronger at speed (98 vs 82 on our capability index).
- •Claude Sonnet 5 is meaningfully stronger at long context (92 vs 70).
- •Claude Haiku 4.5 is 67% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
- •Claude Sonnet 5 has a 1M context window vs 200K - better for whole-repo or long-document work.
Specs comparison
| Claude Haiku 4.5 | Claude Sonnet 5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Type | Closed source | Closed source |
| Context window | 200K | ✓1M |
| Input / 1M tokens | ✓$1.00 | $3.00 |
| Output / 1M tokens | $5.00 | $15.00 |
| Release date | 2025-10 | 2026-06 |
Benchmarks
| Benchmark | Claude Haiku 4.5 | Claude Sonnet 5 |
|---|---|---|
| SWE-bench Verified | 73.3% | ✓~85.2% |
| GPQA | 64.6% | - |
| MMLU Pro | 80.0% | - |
| Terminal-Bench 2.1 | - | 80.4% |
| SWE-bench Pro | - | 63.2% |
| OSWorld-Verified | - | 81.2% |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Claude Haiku 4.5 if...
- →You need high throughput and low latency at minimal cost
- →You are fanning out many parallel sub-agents or worker calls
- →You want solid coding/computer-use quality without Opus/Sonnet pricing
- →Your task fits comfortably within a 200K context window
Choose Claude Sonnet 5 if...
- →You want frontier-adjacent agentic coding but need better cost-efficiency than Opus
- →You are running high-volume agent loops and want strong reasoning per dollar
- →You are already on Sonnet 4.6 and want a same-price capability upgrade
- →You need a 1M context window with fast latency