Claude Opus 4.8 vs Gemini 3.1 Pro Preview Custom Tools
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Opus 4.8 and Gemini 3.1 Pro Preview Custom Tools.
Claude Opus 4.8
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...
Gemini 3.1 Pro Preview Custom Tools
Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...
Technical Specifications
| Specification | Claude Opus 4.8 | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|
| Provider | Anthropic | |
| Context Window | 1,000,000 tokens | 1,048,756 tokens |
| Agent Suitability | 97/100 | N/A |
| Time to First Token (TTFT) | 520 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | beta |
| API Available | Yes | Yes |
| Released Date | 2026-05-27 | 2026-02-25 |
API Pricing Comparison
Input Price per Million Tokens
Claude Opus 4.8
$5.00
Gemini 3.1 Pro Preview Custom Tools
$2.00
Output Price per Million Tokens
Claude Opus 4.8
$25.00
Gemini 3.1 Pro Preview Custom Tools
$12.00
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Claude Opus 4.8 Quirks & Gotchas
- ▸Best-in-class for autonomous code repair and multi-agent orchestration
- ▸Preview model — API may introduce breaking changes without notice
Gemini 3.1 Pro Preview Custom Tools Quirks & Gotchas
No developer gotchas reported.