Claude Opus 5 vs Gemini 3.1 Pro
How Claude Opus 5 (Anthropic) and Gemini 3.1 Pro (Google) compare on price, context window and best-fit use case.
In short: Claude Opus 5 is best for frontier-grade reasoning, deep agents and hard coding work where you want Fable-5-class quality without Fable-5 pricing, while Gemini 3.1 Pro suits long-document and multimodal workloads, RAG over huge corpora, and Google Cloud-native apps. On price it's $5.00 vs $2.00 (under 200K; $4.00 above) per 1M input tokens; on context, 1M tokens (128K max output) vs 2M tokens.
Verdict
Claude Opus 5 is the more capable pick (Bq score 97 vs 92). Choose Gemini 3.1 Pro if budget leads: its input price is $2.00 (under 200K; $4.00 above) per 1M vs $5.00.
| Spec | Claude Opus 5 | Gemini 3.1 Pro |
|---|---|---|
| Developer | Anthropic | |
| Context window | 1M tokens (128K max output) | 2M tokens |
| Input price /1M | $5.00 | $2.00 (under 200K; $4.00 above) |
| Output price /1M | $25.00 | $12.00 (under 200K; $18.00 above) |
| Modalities | text, image | text, image, audio, video |
| Best for | Frontier-grade reasoning, deep agents and hard coding work where you want Fable-5-class quality without Fable-5 pricing. | Long-document and multimodal workloads, RAG over huge corpora, and Google Cloud-native apps. |
Claude Opus 5
- Near-Fable-5 frontier intelligence at half the price
- Same $5/$25 pricing as Opus 4.8, no premium for the upgrade
- 1M-token context window
- Strong agentic and long-horizon coding work
Gemini 3.1 Pro
- Largest mainstream context (2M)
- Strong multimodal reasoning
- Native Google ecosystem integration
- Competitive pricing