Claude Opus 5 vs Gemini 3.1 Pro
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by Anthropic
|
by Google
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Current flagship |
| Released | ||
| Pricing per million tokens | ||
| Input | $5.00/Mtok | $2.00/Mtok |
| Output | $25.00/Mtok | $12.00/Mtok |
| Blended avg | $10.00/Mtok | $4.50/Mtok |
| Cached input | $0.500/Mtok | $0.200/Mtok |
| Specifications | ||
| Context window | 1M tokens | 2M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimageaudiovideo
|
| Benchmarks source: Vellum LLM Leaderboard | ||
| Avg benchmark score | 84.2 | 74.8 |
| Perf / dollar | 8.4 | 16.6 |
| BrowseComp | 90.8 | 85.9 |
| Humanity's Last Exam | 64.7 | 44.4 |
| GPQA Diamond | — | 94.3 |
| SWE-Bench Verified | 97 | — |
| Terminal-Bench 2.1 | — | 70.3 |
| MCP Atlas | — | 69.2 |
| OSWorld-Verified | — | 76.2 |
| ARC-AGI 2 | — | 77.1 |
| HumanEval | — | 80.6 |
| AutoBench | 26 | — |
| Independent composite scores each on its own scale — not part of the average above | ||
| AA Intelligence Index | 50.7 | 30.4 |
| AA Agentic Index | 56.2 | 10.3 |
| AA-Omniscience Index (−100–100) | 37.1 | 31.9 |
| GDPval-AA v2 | 1735.1 ELO | — |
| LMSYS Chatbot Arena | — | 1487 ELO |
| Providers | ||
| Available from |
Anthropic — $5.00/$25.00/Mtok
|
Google — $2.00/$12.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Claude Opus 5 | Gemini 3.1 Pro | Savings |
|---|---|---|---|
| 1M tokens | $10 | $4.5 | $5.5 (55%) |
| 10M tokens | $100 | $45 | $55 (55%) |
| 100M tokens | $1000 | $450 | $550 (55%) |
| 1000M tokens | $10000 | $4500 | $5500 (55%) |
When to pick which
distilled from the pricing and spec data above- raw capability matters more than price: 84.2 vs 74.8 average benchmark score
- cost dominates: $4.50/Mtok blended vs $10.00 — 55% less on the same 50/50 token mix
- you need the longer context: 2M tokens vs 1M (2×)
The cheaper option here — Gemini 3.1 Pro costs $4.50/Mtok blended on Google.
Summary
Claude Opus 5 by Anthropic costs $5.00/Mtok input and $25.00/Mtok output, with a 1M-token context window. It supports text, image input.
Gemini 3.1 Pro by Google costs $2.00/Mtok input and $12.00/Mtok output, with a 2M-token context window. It supports text, image, audio, video input.
On a blended cost basis, Gemini 3.1 Pro is 55% cheaper than Claude Opus 5.It also has a larger context window.
On benchmarks, Claude Opus 5 scores higher (84.2 vs 74.8) on average. In terms of value, Gemini 3.1 Pro has better performance per dollar (16.6 vs 8.4).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.