Model Comparison

Claude Opus 4.5 vs MAI-Code-1-FlashWhich is better in 2026?

Claude Opus 4.5 significantly outperforms across most benchmarks.

Verdict: Claude Opus 4.5 vs MAI-Code-1-Flash — which is better?

Claude Opus 4.5 (by Anthropic) and MAI-Code-1-Flash (by Microsoft) 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 4.5 outperforms in 4 benchmarks (GPQA, SWE-Bench Verified, Tau2 Telecom, Terminal-Bench 2.0), while MAI-Code-1-Flash is better at 0 benchmarks. Claude Opus 4.5 significantly outperforms across most benchmarks.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks

Choose MAI-Code-1-Flash if…

  • you want the most recent training data — it shipped Jun 2026
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Opus 4.5 outperforms in 4 benchmarks (GPQA, SWE-Bench Verified, Tau2 Telecom, Terminal-Bench 2.0), while MAI-Code-1-Flash is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Sat Jun 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Claude Opus 4.5 specifies input context (200,000 tokens). Only Claude Opus 4.5 specifies output context (64,000 tokens).

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Microsoft
MAI-Code-1-Flash
Input- tokens
Output- tokens
Sat Jun 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 4.5 supports multimodal inputs, whereas MAI-Code-1-Flash does not.

Claude Opus 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4.5

Text
Images
Audio
Video

MAI-Code-1-Flash

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.

Claude Opus 4.5

Proprietary

Closed source

MAI-Code-1-Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while MAI-Code-1-Flash was released on 2026-06-02.

MAI-Code-1-Flash is 6 months newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

6 months ago

MAI-Code-1-Flash

Jun 2, 2026

1 weeks ago

6mo newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while MAI-Code-1-Flash's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without MAI-Code-1-Flash's cutoff date.

Claude Opus 4.5

Mar 2025

MAI-Code-1-Flash

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher GPQA score (87.0% vs 84.6%)
Higher SWE-Bench Verified score (80.9% vs 71.6%)
Higher Tau2 Telecom score (98.2% vs 71.7%)
Higher Terminal-Bench 2.0 score (59.3% vs 54.8%)
Microsoft

No standout differentiators in the data we have for this pair.

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Microsoft
MAI-Code-1-Flash

FAQ

Common questions about Claude Opus 4.5 vs MAI-Code-1-Flash.

Which is better, Claude Opus 4.5 or MAI-Code-1-Flash?

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic and MAI-Code-1-Flash is made by Microsoft. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.5 compare to MAI-Code-1-Flash in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. MAI-Code-1-Flash scores AIME 2026: 92.5%, GPQA: 84.6%, IFBench: 75.0%, Tau2 Telecom: 71.7%, SWE-Bench Verified: 71.6%.

What are the context window sizes for Claude Opus 4.5 and MAI-Code-1-Flash?

Claude Opus 4.5 supports 200K tokens and MAI-Code-1-Flash supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4.5 and MAI-Code-1-Flash?

Key differences include multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and MAI-Code-1-Flash?

Claude Opus 4.5 is developed by Anthropic and MAI-Code-1-Flash is developed by Microsoft.

Related comparisons