Gemini 3.1 Pro is roughly half the price of Claude Opus 5.5 on short prompts. Its long-context tier above 200K tokens brings the two almost level, and their cache-hit prices are already identical.
Under 200K tokens, Gemini 3.1 Pro costs half as much as Claude Opus 5.5 on input and 40% less on output. Above 200K, Gemini's rate rises to the same input price as Opus and slightly less on output, so for very long prompts price stops being the deciding factor. Both charge $0.20 per cached 1M tokens at standard length.
| Gemini 3.1 Pro | Claude Opus 5.5 | |
|---|---|---|
| Provider | Anthropic | |
| Tier | Flagship | Flagship |
| Input / 1M tokens | $2.00 | $4.00 |
| Output / 1M tokens | $12.00 | $20.00 |
| Cache hit / 1M | $0.20 | $0.20 |
| Cache write / 1M | — | $5.00 |
| Context window | 1M | 1M |
| Notes | Frontier multimodal (>200K: $4/$18, cache $0.40) | New leading Opus model (Sep 22, 2026); Fable 5.1-level performance at 20% less than Opus 5; included on Pro/Max/Team at no extra cost |
Gemini 3.1 Pro is 2.0× cheaper on input tokens ($2.00 vs $4.00 per 1M). Gemini 3.1 Pro is 40% cheaper on output tokens ($12.00 vs $20.00 per 1M).
| Workload | Gemini 3.1 Pro | Claude Opus 5.5 | Difference |
|---|---|---|---|
| Support chatbot 10,000 conversations × (2,000 input + 400 output tokens) | $88.00 | $160 | Gemini 3.1 Pro saves $72.00 |
| Document Q&A 1,000 questions × (30,000 input + 800 output tokens) | $69.60 | $136 | Gemini 3.1 Pro saves $66.40 |
| Coding agent session 4M input tokens (90% cache hits) + 150,000 output tokens | $3.32 | $5.32 | Gemini 3.1 Pro saves $2.00 |
Standard rates per 1M tokens from data on this site. The coding-agent row assumes 90% of input is read from the prompt cache (full input price where a model has no cache rate). Cache-write fees, batch discounts and long-context surcharges listed in the notes are not included. Updated November 2, 2026.
your prompts stay under 200K tokens and you want the cheaper per-token bill, or you work with multimodal inputs on Google's stack.
your prompts regularly exceed 200K tokens, you want a stable generally-available model rather than a preview, or you need Anthropic's explicit cache controls.
Gemini 3.1 Pro's rate card has a second band for prompts over 200K tokens: input doubles to match Opus 5.5's $4.00, output rises by half to just under Opus's $20.00, and cache hits double. Anthropic bills Opus 5.5's whole 1M window at standard rates. For long-document Q&A above 200K tokens, compare the two on quality, not price.
Both list $0.20 per 1M cached tokens on short prompts. Google also bills explicit-cache storage by the hour for Gemini 3.1 Pro, so a large cache kept warm all day adds a standing cost. Anthropic charges a one-off $5.00 write per 5-minute cache instead. Which is cheaper depends on how often your cache is read versus how long it sits idle.
Google's pricing page lists this model as Gemini 3.1 Pro Preview. Google's newer flagship, Gemini 4 Argon, is currently $2.00/$10.00 on an intro rate through November 30, 2026 — compare it before committing to 3.1 Pro. Both Google and Anthropic halve rates for Batch jobs.
On prompts under 200K tokens, yes: $2.00 vs $4.00 input and $12.00 vs $20.00 output. Above 200K the rates are nearly the same.
No. Anthropic includes the full 1M window at standard pricing for Opus 5.5.
Google's Gemini API pricing page lists it as Gemini 3.1 Pro Preview.
If you are on Google's stack, check it: Argon is Google's newer flagship and is currently priced at $2.00/$10.00 until its intro rate ends on November 30, 2026.
How we choose: prices come from each vendor's official pricing page and are re-checked every week. We take no affiliate fees, so rankings aren't for sale.