DeepSeek: DeepSeek V3.1 Terminus vs OpenAI: GPT-5 Nano (batch)
Head-to-head API pricing and cost comparison between DeepSeek’s DeepSeek: DeepSeek V3.1 Terminus and OpenAI’s OpenAI: GPT-5 Nano (batch). Prices auto-refresh daily from OpenRouter.
OpenAI: GPT-5 Nano (batch) is 91% cheaper for input tokens; OpenAI: GPT-5 Nano (batch) also wins on output tokens.
Side-by-side comparison
| Spec | DeepSeek: DeepSeek V3.1 Terminus | OpenAI: GPT-5 Nano (batch) |
|---|---|---|
| Input price (per 1M) | $0.27 | $0.02 |
| Cached input (per 1M) | $0.14 | $0.00 |
| Output price (per 1M) | $1.00 | $0.20 |
| Batch input (per 1M) | — | $0.01 |
| Batch output (per 1M) | — | $0.10 |
| Reasoning price (per 1M) | — | — |
| Context window | 164K | 400K |
| Vision support | No | Yes |
| Caching support | Yes | Yes |
| 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: DeepSeek V3.1 Terminus | OpenAI: GPT-5 Nano (batch) | Savings |
|---|---|---|---|
1K req/day 500in / 200out tokens | $10.05 | $1.57 | $8.48 OpenAI: GPT-5 Nano (batch) wins |
10K req/day 1500in / 500out tokens | $271.50 | $41.25 | $230.25 OpenAI: GPT-5 Nano (batch) wins |
100K req/day 3000in / 800out tokens | $4,830 | $705.00 | $4,125 OpenAI: GPT-5 Nano (batch) wins |
1M req/day 8000in / 2000out tokens | $124,800 | $18,000 | $106,800 OpenAI: GPT-5 Nano (batch) wins |
Adjust input/output token counts, request volume, batch & cached pricing.
Related comparisons
- Anthropic: Claude Haiku 4.5 vs DeepSeek: DeepSeek V3.1 TerminusCompare pricing →
- Anthropic: Claude Haiku 4.5 (batch) vs DeepSeek: DeepSeek V3.1 TerminusCompare pricing →
- Anthropic: Claude Opus 4.7 vs DeepSeek: DeepSeek V3.1 TerminusCompare pricing →
- Anthropic: Claude Opus 4.7 (batch) vs DeepSeek: DeepSeek V3.1 TerminusCompare pricing →
Frequently asked questions
Which is cheaper, DeepSeek: DeepSeek V3.1 Terminus or OpenAI: GPT-5 Nano (batch)?
For input tokens, OpenAI: GPT-5 Nano (batch) is roughly 91% cheaper at $0.02/1M vs $0.27/1M. For output tokens, OpenAI: GPT-5 Nano (batch) wins at $0.20/1M. Real-world cost depends on your input/output ratio — use the calculator to model your actual workload.
What’s the context window difference?
DeepSeek: DeepSeek V3.1 Terminus has a context window of 164K tokens. OpenAI: GPT-5 Nano (batch) offers 400K 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: DeepSeek V3.1 Terminus or OpenAI: GPT-5 Nano (batch)?
Choose DeepSeek: DeepSeek V3.1 Terminus if you’re already on the DeepSeek stack, want broad ecosystem support, or prefer its feature set. Choose OpenAI: GPT-5 Nano (batch) for OpenAI’s ecosystem, native vision input, or its cheaper input tokens. 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: Sep 7, 2026.