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GPT-6.1 Sol vs Phi 4 Reasoning Plus

GPT-6.1 Sol leads the LLM Stats Score 52.0 to 15.0.

OpenAI · Microsoft · Updated for 2026

Which is better?

GPT-6.1 Sol leads the overall LLM Stats Score 52.0 to 15.0, ranking #11 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-6.1 Sol

  • overall performance matters — it scores 52.0 and ranks #11 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Phi 4 Reasoning Plus

  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

GPT-6.1 Sol
OpenAI
Phi 4 Reasoning Plus
Microsoft
Core performance indexes
LLM Stats Score
52.0
#11
15.0
#239
Reasoning
42.2
#50
15.4
#232
Coding
38.4
#19
5.7
#204
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,050,000
—

Individual benchmarks

10 reported for GPT-6.1 Sol · 11 for Phi 4 Reasoning Plus

No common benchmarks found

GPT-6.1 Sol and Phi 4 Reasoning Plusdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-6.1 Sol specifies input context (1,050,000 tokens). Only GPT-6.1 Sol specifies output context (128,000 tokens).

OpenAI
GPT-6.1 Sol
Input1,050,000 tokens
Output128,000 tokens
Microsoft
Phi 4 Reasoning Plus
Input- tokens
Output- tokens
Wed Sep 30 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-6.1 Sol supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.

GPT-6.1 Sol can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-6.1 Sol

Text
Images
Audio
Video

Phi 4 Reasoning Plus

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-6.1 Sol is licensed under a proprietary license, while Phi 4 Reasoning Plus uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

GPT-6.1 Sol

Proprietary

Closed source

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

GPT-6.1 Sol was released on 2026-09-29, while Phi 4 Reasoning Plus was released on 2025-04-30.

GPT-6.1 Sol is 17 months newer than Phi 4 Reasoning Plus.

GPT-6.1 Sol

Sep 29, 2026

0 days ago

1.4yr newer
Phi 4 Reasoning Plus

Apr 30, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

GPT-6.1 Sol has a knowledge cutoff of 2026-04-30, while Phi 4 Reasoning Plus has a cutoff of 2025-03-01.

GPT-6.1 Sol has more recent training data (up to 2026-04-30), making it potentially better informed about events through that date compared to Phi 4 Reasoning Plus (2025-03-01).

GPT-6.1 Sol

Apr 2026

1.1 yr newer
Phi 4 Reasoning Plus

Mar 2025

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6.1 Sol and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.

GPT-6.1 Sol
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground

FAQ

Common questions about GPT-6.1 Sol vs Phi 4 Reasoning Plus.

Which is better, GPT-6.1 Sol or Phi 4 Reasoning Plus?

GPT-6.1 Sol leads the LLM Stats Score 52.0 to 15.0. GPT-6.1 Sol is made by OpenAI and Phi 4 Reasoning Plus is made by Microsoft. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-6.1 Sol compare to Phi 4 Reasoning Plus in benchmarks?

GPT-6.1 Sol scores HealthBench Consensus: 96.0%, DeepSWE 1.1: 75.2%, OSWorld 2.0: 71.4%, HealthBench Professional: 64.2%, HealthBench: 58.5%. Phi 4 Reasoning Plus scores FlenQA: 97.9%, HumanEval+: 92.3%, IFEval: 84.9%, OmniMath: 81.9%, AIME 2024: 81.3%.

What are the context window sizes for GPT-6.1 Sol and Phi 4 Reasoning Plus?

GPT-6.1 Sol supports 1.1M tokens and Phi 4 Reasoning Plus 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 GPT-6.1 Sol and Phi 4 Reasoning Plus?

Key differences include LLM Stats Score (52.0 vs 15.0), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6.1 Sol and Phi 4 Reasoning Plus?

GPT-6.1 Sol is developed by OpenAI and Phi 4 Reasoning Plus is developed by Microsoft.

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