Claude Sonnet 4 vs Gemini 2.5 Flash (Comparative Analysis)
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Comparative Analysis: Claude Sonnet 4 vs. Gemini 2.5 Flash
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Overview
Claude Sonnet 4 was released 26 days before Gemini 2.5 Flash.
 Claude Sonnet 4 |  Gemini 2.5 Flash | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | Google |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 1M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 64K tokens | 65.5K tokens |
Release Date When this model first became publicly available | May 22, 2025 1 year ago May 22nd, 2025 | June 17, 2025 1 year ago June 17th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | January 31, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Sonnet 4 | Gemini 2.5 Flash | |
|---|---|---|
Input Types Supported input formats | 🖼️Image📝Text📁File | 📁File🖼️Image📝Text🎵Audio🎬Video |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Optional |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | Gemini |
Key Features Advanced capabilities | ✓Function CallingStructured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Pricing
Claude Sonnet 4 is roughly 10.0x more expensive compared to Gemini 2.5 Flash for input tokens and roughly 6.0x more expensive for output tokens.
| Claude Sonnet 4 | Gemini 2.5 Flash | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $3.00 per million tokens | $0.30 per million tokens |
Output Token Cost Cost per million output tokens | $15.00 per million tokens | $2.50 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | $0.014 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.30 per million tokens | $0.03 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $3.75 per million tokens | $0.08 per million tokens |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $6.00 per million tokens | Not specified |
Reasoning Token Cost Cost for internal reasoning tokens | Not specified | $2.50 per million tokens |
Image Input Cost Additional cost for each image input | Not specified | $0.0000003 per image |
Audio Input Cost Additional cost for audio input | Not specified | $0.000001 per unit |
Audio Cache Cost Cost to reuse cached audio input tokens | Not specified | $0.10 per million tokens |
Long Context Pricing Rates for prompts with 200,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | $6.00 per million tokens | Not specified |
Output Token Cost Long-context output cost per million tokens | $22.50 per million tokens | Not specified |
Cache Read Cost Long-context cache read cost per million tokens | $0.60 per million tokens | Not specified |
Cache Write Cost Long-context cache write cost per million tokens | $7.50 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Claude Sonnet 4 and Gemini 2.5 Flash.
| Claude Sonnet 4 | Gemini 2.5 Flash | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 28.9 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 37.6 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 16.6 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,198 Elo (#46 in 3D (57.8% win rate)) | 1,159 Elo (#67 in Data Viz (48.4% win rate)) |
At a Glance
Quick overview of what makes Claude Sonnet 4 and Gemini 2.5 Flash unique.
Claude Sonnet 4 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning. It can handle standard conversations with its 1M token context window. Premium pricing at $3.00/M input and $15.00/M output tokens. Includes built-in content moderation for safer outputs. Released May 22nd, 2025.Gemini 2.5 Flash by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $0.30/M input and $2.50/M output tokens. Released June 17th, 2025.Explore More Comparisons
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