Claude Haiku 4.5 vs GPT-5.5 Instant
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-5.5 Instant is meaningfully stronger at long context (80 vs 70).
- •Claude Haiku 4.5 is 80% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
- •GPT-5.5 Instant has a 1050000 context window vs 200K - better for whole-repo or long-document work.
Specs comparison
| Claude Haiku 4.5 | GPT-5.5 Instant | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Type | Closed source | Closed source |
| Context window | 200K | ✓1050000 |
| Input / 1M tokens | ✓$1.00 | 5.00 |
| Output / 1M tokens | $5.00 | 30.00 |
| Release date | 2025-10 | 2026-05 |
Benchmarks
| Benchmark | Claude Haiku 4.5 | GPT-5.5 Instant |
|---|---|---|
| SWE-bench Verified | 73.3% | - |
| GPQA | 64.6% | - |
| MMLU Pro | 80.0% | - |
| AIME 2025 | - | 81.2 |
| Terminal-Bench 2.0 | - | 82.7 |
| FrontierMath Tier 1–3 | - | 51.7 |
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-5.5 Instant if...
- →Interactive chat and everyday assistant tasks where responsiveness matters most
- →High-volume, latency-sensitive workloads that do not need deep reasoning
- →General questions, drafting, and summarization at speed