Claude 3.5 Haiku is $29.2 cheaper per 1M input tokens (97.3% lower; 37.5x difference).
API cost decision in 10 seconds
Claude 3.5 Haiku vs GPT-5.5 Pro
Pick Claude 3.5 Haiku for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Claude 3.5 Haiku for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Claude 3.5 Haiku is estimated at $2.8 vs $120 for GPT-5.5 Pro, saving $117.2 (97.7% lower).
Cost-first pickClaude 3.5 Haiku
Context-first pickGPT-5.5 Pro
Sample savings$117.297.7%
10x traffic gap$1172
GPT-5.5 Pro has more context, but Claude 3.5 Haiku saves $117.2 on the standard workload. At 10x that traffic, the same price gap is about $1172. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Claude 3.5 Haiku stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Claude 3.5 Haiku | GPT-5.5 Pro |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Claude 3.5 Haiku | $6 | $240 |
| Balanced workload | 1M input + 1M output | Claude 3.5 Haiku | $4.8 | $210 |
| Output-heavy chatbot | 1M input + 5M output | Claude 3.5 Haiku | $20.8 | $930 |
Claude 3.5 Haiku is $176 cheaper per 1M output tokens (97.8% lower; 45x difference).
GPT-5.5 Pro has 850K more context (5.25x larger).
Claude 3.5 Haiku is $117.2 cheaper on the standard workload (97.7% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
Claude 3.5 Haiku has the lower input price; Claude 3.5 Haiku has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Claude 3.5 Haiku is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $2.8 for Claude 3.5 Haiku and $120 for GPT-5.5 Pro.
Choose Claude 3.5 Haiku when you care most about lower input-token price, and lower output-token price.
Choose GPT-5.5 Pro when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Claude 3.5 Haiku is estimated at $2.8 vs $120 for GPT-5.5 Pro, saving $117.2 (97.7% lower).
- Claude 3.5 Haiku is $117.2 cheaper on the standard workload (97.7% lower).
- Claude 3.5 Haiku is $29.2 cheaper per 1M input tokens (97.3% lower; 37.5x difference).
- Claude 3.5 Haiku is $176 cheaper per 1M output tokens (97.8% lower; 45x difference).
- GPT-5.5 Pro has 850K more context (5.25x larger).
| Feature | Claude 3.5 Haiku (Anthropic) | GPT-5.5 Pro (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.8 | $30 |
| Completion Price per 1M tokens | $4 | $180 |
| Sample Workload Cost 1M input + 500K output | $2.8 | $120 |
| Context Window | 200K | 1.05M |
| Release Date | ||
| Popularity | #104 | #122 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Claude 3.5 Haiku | On the standard 1M input plus 500K output workload, Claude 3.5 Haiku is estimated at $2.8 vs $120 for GPT-5.5 Pro, saving $117.2 (97.7% lower). |
| High-volume input processing | Claude 3.5 Haiku | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Claude 3.5 Haiku | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.5 Pro | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Claude 3 Haiku can replace Claude 3.5 Haiku when lower sample workload cost matters most: $0.88.
- gpt-oss-120b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.1.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
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