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Claude Opus 5.5 vs Gemini 2.5 Pro Preview 06-05

Claude Opus 5.5 leads the LLM Stats Score 60.4 to 29.5. Gemini 2.5 Pro Preview 06-05 is 2.3x cheaper per token.

Anthropic · Google · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 60.4 to 29.5, ranking #1 overall.

On price, Gemini 2.5 Pro Preview 06-05 is roughly 2.3x 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 Opus 5.5

  • overall performance matters — it scores 60.4 and ranks #1 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 2.3x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Gemini 2.5 Pro Preview 06-05
Google
Core performance indexes
LLM Stats Score
60.4
#1
29.5
#149
Reasoning
59.5
#1
27.9
#154
Coding
49.9
#1
16.5
#146
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
$1.25 / M
Output price
$20.00 / M
$10.00 / M
Context window
1,000,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Opus 5.5
Gemini 2.5 Pro Preview 06-05
Math
41.8#6
21.6#153
Vision
41.6#1
18.6#95
Multimodal
41.2#1
24.6#64
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 13 for Gemini 2.5 Pro Preview 06-05

No common benchmarks found

Claude Opus 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

Gemini 2.5 Pro Preview 06-05 costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 3.2x more expensive than Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 2.0x more expensive than Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens).

In conclusion, Claude Opus 5.5 is more expensive than Gemini 2.5 Pro Preview 06-05.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sat Oct 24 2026 • llm-stats.com
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
Google
Gemini 2.5 Pro Preview 06-05
Input tokens$1.25
Output tokens$10.00
Best providerGoogle
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Gemini 2.5 Pro Preview 06-05 accepts 1,048,576 input tokens compared to Claude Opus 5.5's 1,000,000 tokens. Claude Opus 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.

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 2.5 Pro Preview 06-05
Input1,048,576 tokens
Output65,535 tokens
Sat Oct 24 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 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 Opus 5.5

Text
Images
Audio
Video

Gemini 2.5 Pro Preview 06-05

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Opus 5.5

Proprietary

Closed source

Gemini 2.5 Pro Preview 06-05

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while Gemini 2.5 Pro Preview 06-05 was released on 2025-06-05.

Claude Opus 5.5 is 16 months newer than Gemini 2.5 Pro Preview 06-05.

Claude Opus 5.5

Sep 22, 2026

3 weeks ago

1.3yr newer
Gemini 2.5 Pro Preview 06-05

Jun 5, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Claude Opus 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 Opus 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).

Claude Opus 5.5

Jun 2026

1.4 yr newer
Gemini 2.5 Pro Preview 06-05

Jan 2025

Provider Availability

Claude Opus 5.5 is available from Anthropic. Gemini 2.5 Pro Preview 06-05 is available from Google.

Claude Opus 5.5

anthropic logo
Anthropic
Input Price:Input: $4.00/1MOutput Price:Output: $20.00/1M

Gemini 2.5 Pro Preview 06-05

google logo
Google
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Opus 5.5 and Gemini 2.5 Pro Preview 06-05 side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Gemini 2.5 Pro Preview 06-05
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Gemini 2.5 Pro Preview 06-05.

Which is better, Claude Opus 5.5 or Gemini 2.5 Pro Preview 06-05?

Claude Opus 5.5 leads the LLM Stats Score 60.4 to 29.5. Claude Opus 5.5 is made by Anthropic and Gemini 2.5 Pro Preview 06-05 is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 5.5 compare to Gemini 2.5 Pro Preview 06-05 in benchmarks?

Claude Opus 5.5 scores BenchCAD (with Python tool): 96.2%, Global-MMLU: 94.3%, SWE-bench Multilingual: 93.9%, MILU: 93.1%, ArXivMath: 91.2%. Gemini 2.5 Pro Preview 06-05 scores Global-MMLU-Lite: 89.2%, AIME 2025: 88.0%, FACTS Grounding: 87.8%, GPQA: 86.4%, VideoMMMU: 83.6%.

Is Claude Opus 5.5 cheaper than Gemini 2.5 Pro Preview 06-05?

Gemini 2.5 Pro Preview 06-05 is 3.2x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. Gemini 2.5 Pro Preview 06-05 costs $1.25/M input and $10.00/M output via google.

What are the context window sizes for Claude Opus 5.5 and Gemini 2.5 Pro Preview 06-05?

Claude Opus 5.5 supports 1.0M tokens and Gemini 2.5 Pro Preview 06-05 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 5.5 and Gemini 2.5 Pro Preview 06-05?

Key differences include LLM Stats Score (60.4 vs 29.5), context window (1.0M vs 1.0M), input pricing ($4.00 vs $1.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Gemini 2.5 Pro Preview 06-05?

Claude Opus 5.5 is developed by Anthropic and Gemini 2.5 Pro Preview 06-05 is developed by Google.

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