AI model comparison
Gemini 3.1 Pro Preview vs Claude Opus 4.5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows.
- Input / 1M
- $2
- Output / 1M
- $12
- Context
- 1.05M
Anthropic
Claude Opus 4.5
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
- Input / 1M
- $5
- Output / 1M
- $25
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 3.1 Pro Preview
2.3x cheaper for a typical chat
Higher intelligence score
Gemini 3.1 Pro Preview
29.7 vs 29.1 on Artificial Analysis
Larger context window
Gemini 3.1 Pro Preview
1.05M vs 200K tokens
Newer release
Gemini 3.1 Pro Preview
Released February 19, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Gemini 3.1 Pro Preview29.7Claude Opus 4.529.1Coding index
Gemini 3.1 Pro Preview68.8Claude Opus 4.5Not availableAgentic index
Gemini 3.1 Pro Preview8.2Claude Opus 4.5Not availablePricing
Gemini 3.1 Pro Preview vs Claude Opus 4.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Gemini 3.1 Pro Preview | Claude Opus 4.5 |
|---|---|---|
| Input tokensPer 1M tokens | $2 | $5 |
| Output tokensPer 1M tokens | $12 | $25 |
| Cached input (read)Per 1M tokens | $0.20 | $0.50 |
| Cache writePer 1M tokens | $0.38 | $6.25 |
| Long-context pricingPer 1M tokens, for very long prompts | $4 in / $18 out above 200K | Same rate at any length |
| Web searchPer request | $0.014 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Gemini 3.1 Pro Preview$10Claude Opus 4.5$22.50Coding task
30K in, 4K out
Gemini 3.1 Pro Preview$108$54 cachedClaude Opus 4.5$250$115 cachedLong document summary
150K in, 2K out
Gemini 3.1 Pro Preview$324$54 cachedClaude Opus 4.5$800$125 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Gemini 3.1 Pro Preview | Claude Opus 4.5 |
|---|---|---|
| Context window | 1.05M tokens | 200K tokens |
| Max output | 66K tokens | 64K tokens |
| Input types | Audio, File, Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | February 19, 2026 | November 24, 2025 |
Features
Supported features
API features available for each model.
| Metric | Gemini 3.1 Pro Preview | Claude Opus 4.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Gemini 3.1 Pro PreviewView full model details- Gemini 3.1 Pro Preview vs Claude Opus 5.5
- Gemini 3.1 Pro Preview vs GPT-6 Astra
- Gemini 3.1 Pro Preview vs GLM 5.2
- Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
- Gemini 3.1 Pro Preview vs GPT-5.3-Codex
- Gemini 3.1 Pro Preview vs Gemini 3 Flash Preview
- Gemini 3.1 Pro Preview vs Claude Opus 4.6
- Gemini 3.1 Pro Preview vs GPT-5.2
- Gemini 3.1 Pro Preview vs Claude Sonnet 4.6
- Gemini 3.1 Pro Preview vs Qwen3.7 Max
- Gemini 3.1 Pro Preview vs GPT-5.2-Codex
Claude Opus 4.5View full model details- Claude Opus 4.5 vs Claude Sonnet 5
- Claude Opus 4.5 vs GLM 5.2
- Claude Opus 4.5 vs GPT-5.3-Codex
- Claude Opus 4.5 vs Claude Opus 4.6
- Claude Opus 4.5 vs GPT-5.2
- Claude Opus 4.5 vs Claude Sonnet 4.6
- Claude Opus 4.5 vs Qwen3.7 Max
- Claude Opus 4.5 vs GPT-5.2-Codex
- Claude Opus 4.5 vs Claude Opus 4.1
- Claude Opus 4.5 vs Claude Sonnet 4.5
Our take
Gemini 3.1 Pro Preview is 2.3x cheaper for a typical chat. Gemini 3.1 Pro Preview scores higher on the Artificial Analysis Intelligence Index (29.7 vs 29.1). Gemini 3.1 Pro Preview has the larger context window (1.05M vs 200K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Gemini 3.1 Pro Preview or Claude Opus 4.5 cheaper?
Gemini 3.1 Pro Preview is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 3.1 Pro Preview costs $2 per 1M input tokens and $12 per 1M output tokens, while Claude Opus 4.5 costs $5 per 1M input tokens and $25 per 1M output tokens.
Which has a bigger context window, Gemini 3.1 Pro Preview or Claude Opus 4.5?
Gemini 3.1 Pro Preview supports up to 1.05M tokens of context, compared with 200K for Claude Opus 4.5.
Is Gemini 3.1 Pro Preview smarter than Claude Opus 4.5?
On the Artificial Analysis Intelligence Index, Gemini 3.1 Pro Preview scores 29.7 and Claude Opus 4.5 scores 29.1, putting Gemini 3.1 Pro Preview ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Gemini 3.1 Pro Preview and Claude Opus 4.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Gemini 3.1 Pro Preview and Claude Opus 4.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Gemini 3.1 Pro Preview and Claude Opus 4.5 at the same time. Compare the answers side by side and keep the best one.