Google: Gemini 3 Flash Preview (batch) vs OpenAI: GPT-4o-mini
Head-to-head API pricing and cost comparison between Google’s Google: Gemini 3 Flash Preview (batch) and OpenAI’s OpenAI: GPT-4o-mini. Prices auto-refresh daily from OpenRouter.
OpenAI: GPT-4o-mini is 40% cheaper for input tokens; OpenAI: GPT-4o-mini also wins on output tokens.
Side-by-side comparison
| Spec | Google: Gemini 3 Flash Preview (batch) | OpenAI: GPT-4o-mini |
|---|---|---|
| Input price (per 1M) | $0.25 | $0.15 |
| Cached input (per 1M) | — | $0.07 |
| Output price (per 1M) | $1.50 | $0.60 |
| Batch input (per 1M) | — | $0.07 |
| Batch output (per 1M) | — | $0.30 |
| Reasoning price (per 1M) | $1.50 | — |
| Context window | 1049K | 128K |
| Vision support | Yes | Yes |
| Caching support | No | Yes |
| Batch API | No | Yes |
| Reasoning capability | Yes | No |
Monthly cost at volume
Estimated monthly API spend at common production traffic levels (input/output tokens per request shown).
| Volume | Google: Gemini 3 Flash Preview (batch) | OpenAI: GPT-4o-mini | Savings |
|---|---|---|---|
1K req/day 500in / 200out tokens | $12.75 | $5.85 | $6.90 OpenAI: GPT-4o-mini wins |
10K req/day 1500in / 500out tokens | $337.50 | $157.50 | $180.00 OpenAI: GPT-4o-mini wins |
100K req/day 3000in / 800out tokens | $5,850 | $2,790 | $3,060 OpenAI: GPT-4o-mini wins |
1M req/day 8000in / 2000out tokens | $150,000 | $72,000 | $78,000 OpenAI: GPT-4o-mini wins |
Adjust input/output token counts, request volume, batch & cached pricing.
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Frequently asked questions
Which is cheaper, Google: Gemini 3 Flash Preview (batch) or OpenAI: GPT-4o-mini?
For input tokens, OpenAI: GPT-4o-mini is roughly 40% cheaper at $0.15/1M vs $0.25/1M. For output tokens, OpenAI: GPT-4o-mini wins at $0.60/1M. Real-world cost depends on your input/output ratio — use the calculator to model your actual workload.
What’s the context window difference?
Google: Gemini 3 Flash Preview (batch) has a context window of 1049K tokens. OpenAI: GPT-4o-mini offers 128K 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 Google: Gemini 3 Flash Preview (batch) or OpenAI: GPT-4o-mini?
Choose Google: Gemini 3 Flash Preview (batch) if you’re already on the Google stack, want reasoning capabilities, or prefer its feature set. Choose OpenAI: GPT-4o-mini 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: Aug 28, 2026.