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#199

Mercury 2.5 Preview

Inception Release: 2026-09-02 Tested on: 2026-10-01 04:24 inception/mercury-2.5-preview::medium
~100BOtherClosedEstimated
(high) (medium) (low) (default)

Summary

Mercury 2.5 Preview scores 6.8 on AI BENCHY and ranks #199. It has 10.0 reliability, a 66.7% pass rate, $0.039 total cost, and 6.66s average response time.

What makes Mercury 2.5 Preview unique: It stands out most in Anti-AI Tricks, where it ranks #1, while Tool Calling is its weakest area at #14. It is notably fast compared with similar models.

Model facts

Researched on 2026-09-02

Estimated
Parameters
~100B
Architecture
Other
Availability
Closed
License
-

Best estimate from public evidence; the vendor did not disclose every value. Inception identifies Mercury 2.5 as a diffusion LLM but does not disclose its parameter count; the estimate follows the Mercury 2 family record.

Parameter source Availability source

Score

6.8

Consistency

9.6

Reliability

10.0

Total Cost (Current Price)

$0.039 ↑ +5.0%

Tested at: $0.037

Total Output Tokens

150,107

Total Input Tokens

397,291

Input Price

$0.040 / 1M

Output Price

$0.150 / 1M

Cache Read Price

N/A

Cache Write Price

N/A

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Tests Correct

Wrong Tests: 8

Attempt pass rate: 66.7%

Flaky tests

1

Flaky tests had mixed outcomes across runs (at least one pass and one fail).

Response Time (avg)

6.66s

Response Time (max): 74.63s

Response Time (total): 153.29s

Wrong answer: 4 API error: 1 Did not follow instructions: 1 Invalid tool call: 1 No answer: 1

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#199 Mercury 2.5 Preview

medium
Cost
$0.001
Time
2.7s
Tokens
2,241 tok

Price History

Historical pricing data for this model from OpenRouter.

Date Input Price Output Price Cache Read Price Cache Write Price
2026-10-01 18:33 $0.040 / 1M $0.150 / 1M N/A N/A

Charts

Choose the first model, then click a second model to open a side-by-side page.

Total Output Tokens

Score vs Total Output Tokens

Quick Compare

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Category Breakdown

Category Score Consistency Tests Correct
Agentic 3.9 9.6
Anti-AI Tricks 10.0 10.0
Coding 7.8 10.0
Combined 6.5 10.0
Data parsing and extraction 10.0 10.0
Domain specific 5.3 7.2
General Intelligence 5.0 10.0
Instructions following 9.8 10.0
Puzzle Solving 10.0 10.0
Tool Calling 3.0 10.0
Trivia 3.0 10.0

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