LLM Toolkit Model comparison
GPT-4o mini vs Claude Haiku 4.5
Verified pricing, context windows and real-workload costs for both models — computed from official provider rates as of 2026-08-26.
Cheaper input
GPT-4o mini
$0.15 /1M in
Cheaper output
GPT-4o mini
$0.60 /1M out
Bigger context
Claude Haiku 4.5
200K tokens
Head to head
| Spec | GPT-4o mini | Claude Haiku 4.5 |
|---|---|---|
| Input / 1M tokens | $0.15 | $1.00 |
| Cached input / 1M | $0.075 | $0.10 |
| Output / 1M tokens | $0.60 | $5.00 |
| Context window | 128K | 200K |
| Provider | OpenAI | Anthropic |
| Price verified | 2026-08-26 | 2026-09-02 |
Monthly cost at three real workloads
| Workload | GPT-4o mini | Claude Haiku 4.5 | Winner |
|---|---|---|---|
| Side-project chatbot 30K req · 2,000 in / 500 out · 40% cached | $16.20/mo | $113.40/mo | GPT-4o mini |
| Coding agent 500K req · 12,000 in / 1,500 out · 70% cached | $1,035/mo | $5,970/mo | GPT-4o mini |
| Bulk extraction 2,000K req · 800 in / 120 out · 20% cached | $360.00/mo | $2,512/mo | GPT-4o mini |
Computed from list prices verified 2026-08-26. 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-4o mini if…
- Input cost dominates your bill — it charges $0.15 per 1M input vs $1.00.
- Your documents fit its 128K window comfortably.
- You run repeat-context workloads — cached input at $0.075 per 1M is the better deal.
Pick Claude Haiku 4.5 if…
- Output-heavy agent loops favor its $5.00 output rate.
- You need 200K tokens of context for large codebases or document sets.
- You want cheaper total spend at your exact volumes — verify with the calculator above.
Frequently asked questions
Is GPT-4o mini cheaper than Claude Haiku 4.5?
GPT-4o mini is cheaper on input at $0.15 per 1M tokens vs $1.00 — input pricing is 6.7× less expensive. On output, GPT-4o mini wins at $0.60 vs $5.00. At a balanced workload (100K requests, 2K in / 500 out), GPT-4o mini runs $60.00/mo vs $450.00/mo — a 7.5× difference.
GPT-4o mini vs Claude Haiku 4.5: which has the bigger context window?
Claude Haiku 4.5, with 200K tokens vs 128K — 1.6× more room. Filling Claude Haiku 4.5's window once costs $0.200 at list price, vs $0.019 for the smaller window.
Should I switch from GPT-4o mini to Claude Haiku 4.5?
Switch if your bottleneck matches Claude Haiku 4.5's strengths: the larger 200K context and its pricing profile. Stay on GPT-4o mini if input cost dominates your bill — GPT-4o mini charges $0.15 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 nano vs Claude Haiku 4.5
- 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
Or measure your real usage with the AI Token Counter and browse all rates on the Pricing Comparison.