Claude Sonnet 4.5 vs Gemini 2.0 Flash
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 Sonnet 4.5 and Gemini 2.0 Flash.
Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Gemini 2.0 Flash
Gemini 2.0 Flash is Google's previous-generation fast, cost-efficient multimodal model, offering a compelling balance of speed, capability, and price. It supports text, image, and audio inputs with native multimodal understanding, making it well-suited for high-volume classification, real-time content moderation, and data extraction pipelines. Gemini 2.0 Flash introduced Google's context caching feature, significantly reducing costs for repeated document processing. While the 3.x series has since succeeded it, Gemini 2.0 Flash remains a popular cost-optimized choice for teams with established Vertex AI workflows.
Technical Specifications
| Specification | Claude Sonnet 4.5 | Gemini 2.0 Flash |
|---|---|---|
| Provider | Anthropic | |
| Context Window | 1,000,000 tokens | 1,048,576 tokens |
| Agent Suitability | 91/100 | 80/100 |
| Time to First Token (TTFT) | 380 ms | 180 ms |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-09-29 | 2025-02-05 |
API Pricing Comparison
Input Price per Million Tokens
Claude Sonnet 4.5
$3.00
Gemini 2.0 Flash
$0.10
Output Price per Million Tokens
Claude Sonnet 4.5
$15.00
Gemini 2.0 Flash
$0.40
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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 Sonnet 4.5 Quirks & Gotchas
- ▸Excellent for long-form writing and nuanced document analysis
- ▸Slightly slower than Sonnet 4.6 — upgrade for production agentic use
Gemini 2.0 Flash Quirks & Gotchas
- ▸Context caching via Vertex AI — up to 75% cost reduction for repeated prompts
- ▸Legacy model — migrate to Gemini 3.1 Flash for improved accuracy