LLM Toolkit Model comparison
GPT-5 nano vs Claude Haiku 4.5
Verified pricing, context windows and real-workload costs for both models — computed from official provider rates as of 2026-08-25.
Cheaper input
GPT-5 nano
$0.05 /1M in
Cheaper output
GPT-5 nano
$0.4 /1M out
Bigger context
GPT-5 nano
400K tokens
Head to head
| Spec | GPT-5 nano | Claude Haiku 4.5 |
|---|---|---|
| Input / 1M tokens | $0.05 | $1.00 |
| Cached input / 1M | $0.005 | $0.1 |
| Output / 1M tokens | $0.4 | $5.00 |
| Context window | 400K | 200K |
| Provider | OpenAI | Anthropic |
| Price verified | 2026-08-25 | 2026-08-25 |
Monthly cost at three real workloads
| Workload | GPT-5 nano | Claude Haiku 4.5 | Winner |
|---|---|---|---|
| Side-project chatbot 30K req · 2,000 in / 500 out · 40% cached | $7.92/mo | $113.40/mo | GPT-5 nano |
| Coding agent 500K req · 12,000 in / 1,500 out · 70% cached | $411.00/mo | $5,970/mo | GPT-5 nano |
| Bulk extraction 2,000K req · 800 in / 120 out · 20% cached | $161.60/mo | $2,512/mo | GPT-5 nano |
Computed from list prices verified 2026-08-25. Cache savings blend normal and cached input rates by the hit rate; models without published cached rates use the base input price. Adjust every parameter yourself on the API Cost Calculator.
Pick GPT-5 nano if…
- Input cost dominates your bill — it charges $0.05 per 1M input vs $1.00.
- You need the larger 400K context window.
- You run repeat-context workloads — cached input at $0.005 per 1M is the better deal.
Pick Claude Haiku 4.5 if…
- Output-heavy agent loops favor its $5.00 output rate.
- Its 200K window covers your typical request with headroom.
- You want cheaper total spend at your exact volumes — verify with the calculator above.
Frequently asked questions
Is GPT-5 nano cheaper than Claude Haiku 4.5?
GPT-5 nano is cheaper on input at $0.05 per 1M tokens vs $1.00 — input pricing is 20× less expensive. On output, GPT-5 nano wins at $0.4 vs $5.00. At a balanced workload (100K requests, 2K in / 500 out), GPT-5 nano runs $30.00/mo vs $450.00/mo — a 15.0× difference.
GPT-5 nano vs Claude Haiku 4.5: which has the bigger context window?
GPT-5 nano, with 400K tokens vs 200K — 2.0× more room. Filling GPT-5 nano's window once costs $0.020 at list price, vs $0.200 for the smaller window.
Should I switch from GPT-5 nano to Claude Haiku 4.5?
Switch if your bottleneck matches Claude Haiku 4.5's strengths: its 200K context fits your documents and its pricing profile. Stay on GPT-5 nano if input cost dominates your bill — GPT-5 nano charges $0.05 per 1M in. Test both with your real token counts before committing.
Keep comparing
- GPT-5 vs Claude Opus 5
- GPT-5 mini vs Claude Sonnet 5
- GPT-5 vs Gemini 3.5 Flash
- Gemini 3.5 Flash vs GPT-5 mini
- Gemini 3.5 Flash vs Claude Sonnet 5
- Claude Opus 5 vs Gemini 3.5 Flash
- GPT-5 vs GPT-5 mini
- GPT-5 mini vs GPT-5 nano
Or measure your real usage with the AI Token Counter and browse all rates on the Pricing Comparison.