Claude Sonnet 5.5 vs Gemini 2.5 Pro Preview 06-05
Claude Sonnet 5.5 leads the LLM Stats Score 58.7 to 29.9. Gemini 2.5 Pro Preview 06-05 is 1.2x cheaper per token.
Anthropic · Google · Updated for 2026
Which is better?
Claude Sonnet 5.5 leads the overall LLM Stats Score 58.7 to 29.9, ranking #2 overall.
On price, Gemini 2.5 Pro Preview 06-05 is roughly 1.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Gemini 2.5 Pro Preview 06-05 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Sonnet 5.5
- overall performance matters — it scores 58.7 and ranks #2 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you want the most recent training data — it shipped Sep 2026
Choose Gemini 2.5 Pro Preview 06-05
- cost matters — it's about 1.2x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
47 reported for Claude Sonnet 5.5 · 13 for Gemini 2.5 Pro Preview 06-05
Claude Sonnet 5.5 and Gemini 2.5 Pro Preview 06-05don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Sonnet 5.5 ($2.00/1M tokens) is 1.6x more expensive than Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens).
For output processing, Claude Sonnet 5.5 ($10.00/1M tokens) costs the same as Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens).
In conclusion, Claude Sonnet 5.5 is more expensive than Gemini 2.5 Pro Preview 06-05.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 2.5 Pro Preview 06-05 accepts 1,048,576 input tokens compared to Claude Sonnet 5.5's 1,000,000 tokens. Claude Sonnet 5.5 can generate longer responses up to 128,000 tokens, while Gemini 2.5 Pro Preview 06-05 is limited to 65,535 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Sonnet 5.5 and Gemini 2.5 Pro Preview 06-05 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Sonnet 5.5
Gemini 2.5 Pro Preview 06-05
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Sonnet 5.5 was released on 2026-09-28, while Gemini 2.5 Pro Preview 06-05 was released on 2025-06-05.
Claude Sonnet 5.5 is 16 months newer than Gemini 2.5 Pro Preview 06-05.
Sep 28, 2026
2 weeks ago
1.3yr newerJun 5, 2025
1.4 years ago
Knowledge Cutoff
When training data ends
Claude Sonnet 5.5 has a knowledge cutoff of 2026-06-01, while Gemini 2.5 Pro Preview 06-05 has a cutoff of 2025-01-31.
Claude Sonnet 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to Gemini 2.5 Pro Preview 06-05 (2025-01-31).
Jun 2026
1.4 yr newerJan 2025
Provider Availability
Claude Sonnet 5.5 is available from Anthropic. Gemini 2.5 Pro Preview 06-05 is available from Google.
Claude Sonnet 5.5
Gemini 2.5 Pro Preview 06-05
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Sonnet 5.5 and Gemini 2.5 Pro Preview 06-05 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Sonnet 5.5 vs Gemini 2.5 Pro Preview 06-05.