Claude Sonnet 4.5vs
Gemini 2.5 Flash Preview 09-2025
Compare performance metrics, pricing, and capabilities of these AI models.
Key Differences
Context Length
Lower
Claude Sonnet 4.5: 1.0M (disadvantage)
Gemini 2.5 Flash Preview 09-2025: 1.0M (advantage)
Cost Efficiency
Higher Cost
Prompt: $3.00M vs $0.30M
Completion: $15.00M vs $2.50M
Capabilities
Claude Sonnet 4.5
Modality: text+image->text
Inputs: text, image, file
Gemini 2.5 Flash Preview 09-2025
Modality: text+image->text
Inputs: image, file, text
A
Claude Sonnet 4.5
anthropic/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-ar...
Context Length1.0M
Prompt Price$3.00M
ReleasedSeptember 29, 2025
Supports:
text+image->textG
Gemini 2.5 Flash Preview 09-2025
google/gemini-2.5-flash-preview-09-2025
Gemini 2.5 Flash Preview September 2025 Checkpoint is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding,...
Context Length1.0M
Prompt Price$0.30M
ReleasedSeptember 25, 2025
Supports:
text+image->textDetailed Comparison
| Feature | | |
|---|---|---|
| Context Length | 1.0M | 1.0M |
| Prompt Price | $3.00M | $0.30M |
| Completion Price | $15.00M | $2.50M |
| Modality | text+image->text | text+image->text |
| Release Date | September 29, 2025 | September 25, 2025 |
Analysis & Recommendations
Quick Summary
This comparison reveals key trade-offs between Claude Sonnet 4.5 and Gemini 2.5 Flash Preview 09-2025. Gemini 2.5 Flash Preview 09-2025 offers a larger context window of 1.0M compared to Claude Sonnet 4.5's 1.0M, though Claude Sonnet 4.5 comes at a higher cost.
Claude Sonnet 4.5 Strengths
- •Competitive context size (1.0M)
- •Premium pricing for high-quality output
- •Multimodal capabilities for image analysis
- •Latest generation model
Gemini 2.5 Flash Preview 09-2025 Strengths
- •Larger context window (1.0M) for processing longer documents
- •More cost-effective per token
- •Multimodal capabilities for image analysis
- •Proven and stable model
When to Use Each Model
Choose Claude Sonnet 4.5 when:
- • You need competitive context capability for complex tasks
- • Cost efficiency is not the primary concern in your use case
- • Working with images and text that benefit from thoughtful reasoning
Choose Gemini 2.5 Flash Preview 09-2025 when:
- • You need the larger context window for long-form content
- • Cost efficiency is important for your budget
- • Working with images and text that require vision capabilities
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