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#84

Claude Opus 4.8

Anthropic Release: 2026-05-28 Tested on: 2026-10-01 01:39 anthropic/claude-opus-4.8::medium
~5T total (~500B active)MoEClosedEstimated
(medium) (low) (none)

Summary

Claude Opus 4.8 scores 8.3 on AI BENCHY and ranks #84. It has 10.0 reliability, a 82.6% pass rate, $3.490 total cost, and 16.72s average response time.

Model facts

Researched on 2026-08-12

Estimated
Parameters
~5T total (~500B active)
Architecture
MoE
Availability
Closed
License
-

Best estimate from public evidence; the vendor did not disclose every value. External industry estimate; vendor has not disclosed the architecture.

Parameter source Availability source

Score

8.3

Consistency

9.0

Reliability

10.0

Total Cost (Current Price)

$3.490

Total Output Tokens

67,522

Total Input Tokens

360,294

Input Price

$5.000 / 1M

Output Price

$25.000 / 1M

Cache Read Price

$0.500 / 1M

Cache Write Price

$6.250 / 1M

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: 6

Attempt pass rate: 82.6%

Flaky tests

3

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

Response Time (avg)

16.72s

Response Time (max): 99.37s

Response Time (total): 384.66s

Wrong answer: 5 No answer: 1

Hamster playing table tennis

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

#84 Claude Opus 4.8

medium
Cost
$0.057
Time
23.1s
Tokens
2,412 tok

Run history

Tested on Score Reliability Tests Correct Total Cost Compare
2026-10-01 01:39 Re-test 8.3 10.0 $3.490 Current run
2026-07-16 22:32 New test added 8.8 10.0 $1.931 Compare
2026-06-30 22:01 Re-test 8.8 10.0 $1.107 Compare
2026-06-04 13:45 New test added 8.7 10.0 $1.107 Compare
2026-05-28 17:34 Initial run 8.7 10.0 $1.006 Compare

This run used a different benchmark suite. Keep suite changes in mind when reading historical movement.

Price History

Historical pricing data for this model from OpenRouter.

Date Input Price Output Price Cache Read Price Cache Write Price
2026-08-14 12:51 $5.000 / 1M $25.000 / 1M N/A N/A
2026-10-01 18:33 $5.000 / 1M $25.000 / 1M $0.500 / 1M $6.250 / 1M

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 10.0 10.0
Combined 9.9 10.0
Data parsing and extraction 7.1 5.6
Domain specific 3.6 7.2
General Intelligence 10.0 10.0
Instructions following 10.0 10.0
Puzzle Solving 10.0 10.0
Tool Calling 10.0 10.0
Trivia 3.0 10.0

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