Model Comparison

GPT-5.2 vs Mercury 2

GPT-5.2 significantly outperforms across most benchmarks. Mercury 2 is 12.8x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT-5.2 outperforms in 2 benchmarks (AIME 2025, GPQA), while Mercury 2 is better at 0 benchmarks.

GPT-5.2 significantly outperforms across most benchmarks.

Thu Apr 30 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Mercury 2 costs less

For input processing, GPT-5.2 ($1.75/1M tokens) is 7.0x more expensive than Mercury 2 ($0.25/1M tokens).

For output processing, GPT-5.2 ($14.00/1M tokens) is 18.7x more expensive than Mercury 2 ($0.75/1M tokens).

In conclusion, GPT-5.2 is more expensive than Mercury 2.*

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

Lowest available price from all providers
Thu Apr 30 2026 • llm-stats.com
OpenAI
GPT-5.2
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Inception
Mercury 2
Input tokens$0.25
Output tokens$0.75
Best providerInception
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 Mercury 2's 128,000 tokens. GPT-5.2 can generate longer responses up to 128,000 tokens, while Mercury 2 is limited to 8,192 tokens.

OpenAI
GPT-5.2
Input400,000 tokens
Output128,000 tokens
Inception
Mercury 2
Input128,000 tokens
Output8,192 tokens
Thu Apr 30 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.2 supports multimodal inputs, whereas Mercury 2 does not.

GPT-5.2 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.2

Text
Images
Audio
Video

Mercury 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.

GPT-5.2

Proprietary

Closed source

Mercury 2

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.2 was released on 2025-12-11, while Mercury 2 was released on 2026-02-24.

Mercury 2 is 3 months newer than GPT-5.2.

GPT-5.2

Dec 11, 2025

4 months ago

Mercury 2

Feb 24, 2026

2 months ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-5.2 has a documented knowledge cutoff of 2025-08-25, while Mercury 2's cutoff date is not specified.

We can confirm GPT-5.2's training data extends to 2025-08-25, but cannot make a direct comparison without Mercury 2's cutoff date.

GPT-5.2

Aug 2025

Mercury 2

—

Provider Availability

GPT-5.2 is available from OpenAI. Mercury 2 is available from Inception.

GPT-5.2

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M

Mercury 2

inception logo
Inception
Input Price:Input: $0.25/1MOutput Price:Output: $0.75/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Higher AIME 2025 score (100.0% vs 91.1%)
Higher GPQA score (92.4% vs 74.0%)
Inception
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.2
Inception
Mercury 2

FAQ

Common questions about GPT-5.2 vs Mercury 2

GPT-5.2 significantly outperforms across most benchmarks. GPT-5.2 is made by OpenAI and Mercury 2 is made by Inception. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
GPT-5.2 scores AIME 2025: 100.0%, HMMT 2025: 99.4%, Tau2 Telecom: 98.7%, Graphwalks BFS <128k: 94.0%, GPQA: 92.4%. Mercury 2 scores AIME 2025: 91.1%, GPQA: 74.0%, IFBench: 71.0%, LiveCodeBench: 67.0%, Tau2 Airline: 53.0%.
Mercury 2 is 7.0x cheaper for input tokens. GPT-5.2 costs $1.75/M input and $14.00/M output via openai. Mercury 2 costs $0.25/M input and $0.75/M output via inception.
GPT-5.2 supports 400K tokens and Mercury 2 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (400K vs 128K), input pricing ($1.75 vs $0.25/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.
GPT-5.2 is developed by OpenAI and Mercury 2 is developed by Inception.