Model Comparison

Claude Opus 4.5 vs GPT-5.2Which is better in 2026?

Claude Opus 4.5 has a slight edge in benchmark performance. GPT-5.2 is 2.1x cheaper per token.

Verdict: Claude Opus 4.5 vs GPT-5.2 — which is better?

Claude Opus 4.5 (by Anthropic) and GPT-5.2 (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Opus 4.5 outperforms in 4 benchmarks (MCP Atlas, MMMLU, SWE-Bench Verified, Tau2 Retail), while GPT-5.2 is better at 3 benchmarks (ARC-AGI v2, GPQA, Tau2 Telecom). Claude Opus 4.5 has a slight edge in benchmark performance.

On price, GPT-5.2 is roughly 2.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.2 also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 4 of 7 shared benchmarks

Choose GPT-5.2 if…

  • cost matters — it's about 2.1x cheaper per token
  • you process long inputs — it offers a 400,000 token context window
  • you want the most recent training data — it shipped Dec 2025
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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Claude Opus 4.5 outperforms in 4 benchmarks (MCP Atlas, MMMLU, SWE-Bench Verified, Tau2 Retail), while GPT-5.2 is better at 3 benchmarks (ARC-AGI v2, GPQA, Tau2 Telecom).

Claude Opus 4.5 has a slight edge in benchmark performance.

Sun Jun 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.2 costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 2.9x more expensive than GPT-5.2 ($1.75/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 1.8x more expensive than GPT-5.2 ($14.00/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than GPT-5.2.*

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

Lowest available price from all providers
Sun Jun 14 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
OpenAI
GPT-5.2
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.2 accepts 400,000 input tokens compared to Claude Opus 4.5's 200,000 tokens. GPT-5.2 can generate longer responses up to 128,000 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-5.2
Input400,000 tokens
Output128,000 tokens
Sun Jun 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and GPT-5.2 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 4.5

Text
Images
Audio
Video

GPT-5.2

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 4.5

Proprietary

Closed source

GPT-5.2

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while GPT-5.2 was released on 2025-12-11.

GPT-5.2 is 1 month newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

6 months ago

GPT-5.2

Dec 11, 2025

6 months ago

2w newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a knowledge cutoff of 2025-03-31, while GPT-5.2 has a cutoff of 2025-08-25.

GPT-5.2 has more recent training data (up to 2025-08-25), making it potentially better informed about events through that date compared to Claude Opus 4.5 (2025-03-31).

Claude Opus 4.5

Mar 2025

GPT-5.2

Aug 2025

5 mo newer

Provider Availability

Claude Opus 4.5 is available from Anthropic. GPT-5.2 is available from OpenAI.

Claude Opus 4.5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

GPT-5.2

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Higher MCP Atlas score (62.3% vs 60.6%)
Higher MMMLU score (90.8% vs 89.6%)
Higher SWE-Bench Verified score (80.9% vs 80.0%)
Higher Tau2 Retail score (88.9% vs 82.0%)
OpenAI
Larger context window (400,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher ARC-AGI v2 score (52.9% vs 37.6%)
Higher GPQA score (92.4% vs 87.0%)
Higher Tau2 Telecom score (98.7% vs 98.2%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
OpenAI
GPT-5.2

FAQ

Common questions about Claude Opus 4.5 vs GPT-5.2.

Which is better, Claude Opus 4.5 or GPT-5.2?

Claude Opus 4.5 has a slight edge in benchmark performance. Claude Opus 4.5 is made by Anthropic and GPT-5.2 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.5 compare to GPT-5.2 in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. GPT-5.2 scores AIME 2025: 100.0%, HMMT 2025: 99.4%, Tau2 Telecom: 98.7%, Graphwalks BFS <128k: 94.0%, GPQA: 92.4%.

Is Claude Opus 4.5 cheaper than GPT-5.2?

GPT-5.2 is 2.9x cheaper for input tokens. Claude Opus 4.5 costs $5.00/M input and $25.00/M output via anthropic. GPT-5.2 costs $1.75/M input and $14.00/M output via openai.

What are the context window sizes for Claude Opus 4.5 and GPT-5.2?

Claude Opus 4.5 supports 200K tokens and GPT-5.2 supports 400K 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 4.5 and GPT-5.2?

Key differences include context window (200K vs 400K), input pricing ($5.00 vs $1.75/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and GPT-5.2?

Claude Opus 4.5 is developed by Anthropic and GPT-5.2 is developed by OpenAI.

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