Claude Haiku 4.5 vs GPT-5.6
Pricing, benchmarks, and use case comparison
Quick take
- •Claude Haiku 4.5 is meaningfully stronger at cost efficiency (97 vs 70 on our capability index).
- •GPT-5.6 is meaningfully stronger at math (92 vs 68).
- •Claude Haiku 4.5 is 80% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
Specs comparison
| Claude Haiku 4.5 | GPT-5.6 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓200K | Not announced |
| Input / 1M tokens | ✓$1.00 | 5 |
| Output / 1M tokens | $5.00 | 30 |
| Release date | 2025-10 | 2026-06 |
Benchmarks
| Benchmark | Claude Haiku 4.5 | GPT-5.6 |
|---|---|---|
| SWE-bench Verified | 73.3% | - |
| GPQA | 64.6% | - |
| MMLU Pro | 80.0% | - |
| Terminal-Bench 2.1 (Sol) | - | 88.8% |
| Terminal-Bench 2.1 (Terra) | - | 82.5% |
| Terminal-Bench 2.1 (Luna) | - | 84.3% |
| Terminal-Bench 2.1 | - | 88.8 |
| ExploitBench | - | Competitive with Anthropic Mythos Preview |
| ExploitGym | - | Significant improvements |
| GeneBench v1 | - | Not announced |
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 GPT-5.6 if...
- →You want to standardize on one model generation but route requests across cost/quality tiers
- →You are an approved preview partner exploring the newest OpenAI capabilities
- →Workloads spanning agentic coding, knowledge work, and research where tier flexibility helps