DeepSeek: R1 vs OpenAI: GPT-5.5 Pro
Head-to-head API pricing and cost comparison between DeepSeek’s DeepSeek: R1 and OpenAI’s OpenAI: GPT-5.5 Pro. Prices auto-refresh daily from OpenRouter.
DeepSeek: R1 is 98% cheaper for input tokens; DeepSeek: R1 also wins on output tokens.
Side-by-side comparison
| Spec | DeepSeek: R1 | OpenAI: GPT-5.5 Pro |
|---|---|---|
| Input price (per 1M) | $0.70 | $30.00 |
| Cached input (per 1M) | — | — |
| Output price (per 1M) | $2.50 | $180.00 |
| Batch input (per 1M) | — | $15.00 |
| Batch output (per 1M) | — | $90.00 |
| Reasoning price (per 1M) | — | — |
| Context window | 164K | 1050K |
| Vision support | No | Yes |
| Caching support | No | No |
| Batch API | No | Yes |
| Reasoning capability | No | No |
Monthly cost at volume
Estimated monthly API spend at common production traffic levels (input/output tokens per request shown).
| Volume | DeepSeek: R1 | OpenAI: GPT-5.5 Pro | Savings |
|---|---|---|---|
1K req/day 500in / 200out tokens | $25.50 | $1,530 | $1,505 DeepSeek: R1 wins |
10K req/day 1500in / 500out tokens | $690.00 | $40,500 | $39,810 DeepSeek: R1 wins |
100K req/day 3000in / 800out tokens | $12,300 | $702,000 | $689,700 DeepSeek: R1 wins |
1M req/day 8000in / 2000out tokens | $318,000 | $18,000,000 | $17,682,000 DeepSeek: R1 wins |
Adjust input/output token counts, request volume, batch & cached pricing.
Related comparisons
Frequently asked questions
Which is cheaper, DeepSeek: R1 or OpenAI: GPT-5.5 Pro?
For input tokens, DeepSeek: R1 is roughly 98% cheaper at $0.70/1M vs $30.00/1M. For output tokens, DeepSeek: R1 wins at $2.50/1M. Real-world cost depends on your input/output ratio — use the calculator to model your actual workload.
What’s the context window difference?
DeepSeek: R1 has a context window of 164K tokens. OpenAI: GPT-5.5 Pro offers 1050K tokens. Larger context windows are valuable for long documents, RAG pipelines, and multi-turn conversations — but they come with higher input-token bills if you fill them every request.
Should I use DeepSeek: R1 or OpenAI: GPT-5.5 Pro?
Choose DeepSeek: R1 if you’re already on the DeepSeek stack, want broad ecosystem support, or prefer its lower input price. Choose OpenAI: GPT-5.5 Pro for OpenAI’s ecosystem, native vision input, or its differentiated capabilities. Run a small benchmark on your own prompts before committing — price is only one axis.
How are these prices kept current?
Prices are pulled directly from OpenRouter’s public models API once every 24 hours via a Convex cron job, then normalized to per-1M-token figures. Last refresh: May 28, 2026.