Anthropic: Claude Sonnet 4.6 (batch) vs Google: Gemini 3 Flash Preview (batch)
Head-to-head API pricing and cost comparison between Anthropic’s Anthropic: Claude Sonnet 4.6 (batch) and Google’s Google: Gemini 3 Flash Preview (batch). Prices auto-refresh daily from OpenRouter.
Google: Gemini 3 Flash Preview (batch) is 83% cheaper for input tokens; Google: Gemini 3 Flash Preview (batch) also wins on output tokens.
Side-by-side comparison
| Spec | Anthropic: Claude Sonnet 4.6 (batch) | Google: Gemini 3 Flash Preview (batch) |
|---|---|---|
| Input price (per 1M) | $1.50 | $0.25 |
| Cached input (per 1M) | $0.15 | — |
| Output price (per 1M) | $7.50 | $1.50 |
| Batch input (per 1M) | $0.75 | — |
| Batch output (per 1M) | $3.75 | — |
| Reasoning price (per 1M) | — | $1.50 |
| Context window | 1000K | 1049K |
| Vision support | Yes | Yes |
| Caching support | Yes | No |
| Batch API | Yes | No |
| Reasoning capability | No | Yes |
Monthly cost at volume
Estimated monthly API spend at common production traffic levels (input/output tokens per request shown).
| Volume | Anthropic: Claude Sonnet 4.6 (batch) | Google: Gemini 3 Flash Preview (batch) | Savings |
|---|---|---|---|
1K req/day 500in / 200out tokens | $67.50 | $12.75 | $54.75 Google: Gemini 3 Flash Preview (batch) wins |
10K req/day 1500in / 500out tokens | $1,800 | $337.50 | $1,463 Google: Gemini 3 Flash Preview (batch) wins |
100K req/day 3000in / 800out tokens | $31,500 | $5,850 | $25,650 Google: Gemini 3 Flash Preview (batch) wins |
1M req/day 8000in / 2000out tokens | $810,000 | $150,000 | $660,000 Google: Gemini 3 Flash Preview (batch) wins |
Adjust input/output token counts, request volume, batch & cached pricing.
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Frequently asked questions
Which is cheaper, Anthropic: Claude Sonnet 4.6 (batch) or Google: Gemini 3 Flash Preview (batch)?
For input tokens, Google: Gemini 3 Flash Preview (batch) is roughly 83% cheaper at $0.25/1M vs $1.50/1M. For output tokens, Google: Gemini 3 Flash Preview (batch) wins at $1.50/1M. Real-world cost depends on your input/output ratio — use the calculator to model your actual workload.
What’s the context window difference?
Anthropic: Claude Sonnet 4.6 (batch) has a context window of 1000K tokens. Google: Gemini 3 Flash Preview (batch) offers 1049K 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 Anthropic: Claude Sonnet 4.6 (batch) or Google: Gemini 3 Flash Preview (batch)?
Choose Anthropic: Claude Sonnet 4.6 (batch) if you’re already on the Anthropic stack, want broad ecosystem support, or prefer its feature set. Choose Google: Gemini 3 Flash Preview (batch) for Google’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 27, 2026.