Claude Haiku 4.5 vs GPT-5.6 Sol
Pricing, benchmarks, and use case comparison
Quick take
- •Claude Haiku 4.5 is meaningfully stronger at cost efficiency (97 vs 55 on our capability index).
- •GPT-5.6 Sol is meaningfully stronger at math (95 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 Sol | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓200K | Not announced |
| Input / 1M tokens | ✓$1.00 | $5.00 |
| Output / 1M tokens | $5.00 | $30.00 |
| Release date | 2025-10 | 2026-06 |
Benchmarks
| Benchmark | Claude Haiku 4.5 | GPT-5.6 Sol |
|---|---|---|
| SWE-bench Verified | 73.3% | - |
| GPQA | 64.6% | - |
| MMLU Pro | 80.0% | - |
| Terminal-Bench 2.1 | - | 88.8% |
| Terminal-Bench 2.1 (Ultra) | - | 91.9% |
| ExploitBench | - | competitive with Mythos Preview |
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 Sol if...
- →You are an approved preview partner needing the most capable model for agentic software engineering
- →Complex multi-step tasks that benefit from subagent orchestration (Ultra) or maximum reasoning depth (max)
- →Frontier scientific research, professional knowledge work, or security-sensitive workloads