Model Comparison
Claude Opus 4 vs Mercury 2Which is better in 2026?
Both models are evenly matched across the benchmarks. Mercury 2 is 80.0x cheaper per token.
Verdict: Claude Opus 4 vs Mercury 2 — which is better?
Claude Opus 4 (by Anthropic) and Mercury 2 (by Inception) 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 outperforms in 1 benchmarks (GPQA), while Mercury 2 is better at 1 benchmark (AIME 2025). Both models are evenly matched across the benchmarks.
On price, Mercury 2 is roughly 80.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Opus 4 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude Opus 4 if…
- you process long inputs — it offers a 200,000 token context window
Choose Mercury 2 if…
- cost matters — it's about 80.0x cheaper per token
- you want the most recent training data — it shipped Feb 2026
Performance Benchmarks
Comparative analysis across standard metrics
Claude Opus 4 outperforms in 1 benchmarks (GPQA), while Mercury 2 is better at 1 benchmark (AIME 2025).
Both models are evenly matched across the benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 4 ($15.00/1M tokens) is 60.0x more expensive than Mercury 2 ($0.25/1M tokens).
For output processing, Claude Opus 4 ($75.00/1M tokens) is 100.0x more expensive than Mercury 2 ($0.75/1M tokens).
In conclusion, Claude Opus 4 is more expensive than Mercury 2.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 4 accepts 200,000 input tokens compared to Mercury 2's 128,000 tokens. Claude Opus 4 can generate longer responses up to 32,000 tokens, while Mercury 2 is limited to 8,192 tokens.
Input Capabilities
Supported data types and modalities
Claude Opus 4 supports multimodal inputs, whereas Mercury 2 does not.
Claude Opus 4 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Opus 4
Mercury 2
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Opus 4 was released on 2025-05-22, while Mercury 2 was released on 2026-02-24.
Mercury 2 is 9 months newer than Claude Opus 4.
May 22, 2025
1.1 years ago
Feb 24, 2026
4 months ago
9mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude Opus 4 is available from Anthropic, Bedrock, Google. Mercury 2 is available from Inception.
Claude Opus 4
Mercury 2
Outputs Comparison
Key Takeaways
Claude Opus 4
View detailsAnthropic
Mercury 2
View detailsInception
Claude Opus 4Mercury 2Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude Opus 4 and Mercury 2 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude Opus 4 vs Mercury 2.