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#223

Mercury 2.5 Preview

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

Summary

Mercury 2.5 Preview scores 6.5 on AI BENCHY and ranks #223. It has 9.9 reliability, a 65.2% pass rate, $0.040 total cost, and 7.61s average response time.

What makes Mercury 2.5 Preview unique: It stands out most in Puzzle Solving, where it ranks #1, while Tool Calling is its weakest area at #16. Its total benchmark cost is unusually low for its score range.

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

6.5

Consistency

8.0

Reliability

9.9

Total Cost (Current Price)

$0.040 ↑ +2.1%

Tested at: $0.039

Total Output Tokens

180,597

Total Input Tokens

298,512

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: 11

Attempt pass rate: 65.2%

Flaky tests

6

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

Response Time (avg)

7.61s

Response Time (max): 86.84s

Response Time (total): 175.08s

Wrong answer: 6 Did not follow instructions: 2 API error: 1 Invalid tool call: 1 Timed out: 1

Hamster playing table tennis

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

#223 Mercury 2.5 Preview

high
Cost
$0.001
Time
4.5s
Tokens
3,851 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 6.1 3.1
Anti-AI Tricks 10.0 10.0
Coding 6.7 7.8
Combined 3.8 1.6
Data parsing and extraction 10.0 10.0
Domain specific 2.9 4.4
General Intelligence 5.1 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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