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GPT-6 Sol vs Phi 4 Reasoning Plus

GPT-6 Sol leads the LLM Stats Score 49.4 to 15.0.

OpenAI · Microsoft · Updated for 2026

Which is better?

GPT-6 Sol leads the overall LLM Stats Score 49.4 to 15.0, ranking #21 overall.

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

Choose GPT-6 Sol

  • overall performance matters — it scores 49.4 and ranks #21 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 Sol
OpenAI
Phi 4 Reasoning Plus
Microsoft
Core performance indexes
LLM Stats Score
49.4
#21
15.0
#237
Reasoning
45.6
#29
15.4
#230
Coding
35.8
#25
5.7
#202
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,050,000
—

Individual benchmarks

5 reported for GPT-6 Sol · 11 for Phi 4 Reasoning Plus

No common benchmarks found

GPT-6 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 Sol specifies input context (1,050,000 tokens). Only GPT-6 Sol specifies output context (128,000 tokens).

OpenAI
GPT-6 Sol
Input1,050,000 tokens
Output128,000 tokens
Microsoft
Phi 4 Reasoning Plus
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-6 Sol supports multimodal inputs, whereas Phi 4 Reasoning Plus does not.

GPT-6 Sol can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-6 Sol

Text
Images
Audio
Video

Phi 4 Reasoning Plus

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-6 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 Sol

Proprietary

Closed source

Phi 4 Reasoning Plus

MIT

Open weights

Release Timeline

When each model was launched

GPT-6 Sol was released on 2026-09-22, while Phi 4 Reasoning Plus was released on 2025-04-30.

GPT-6 Sol is 17 months newer than Phi 4 Reasoning Plus.

GPT-6 Sol

Sep 22, 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 Sol has a knowledge cutoff of 2026-04-20, while Phi 4 Reasoning Plus has a cutoff of 2025-03-01.

GPT-6 Sol has more recent training data (up to 2026-04-20), making it potentially better informed about events through that date compared to Phi 4 Reasoning Plus (2025-03-01).

GPT-6 Sol

Apr 2026

1.1 yr newer
Phi 4 Reasoning Plus

Mar 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-6 Sol and Phi 4 Reasoning Plus side-by-side, then vote on the output you prefer.

GPT-6 Sol
✓ Preferred
Phi 4 Reasoning Plus
Open in Playground

FAQ

Common questions about GPT-6 Sol vs Phi 4 Reasoning Plus.

Which is better, GPT-6 Sol or Phi 4 Reasoning Plus?

GPT-6 Sol leads the LLM Stats Score 49.4 to 15.0. GPT-6 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 Sol compare to Phi 4 Reasoning Plus in benchmarks?

GPT-6 Sol scores DeepSWE 1.1: 68.8%, OSWorld 2.0: 64.4%, Agents' Last Exam: 56.4%, FrontierCode 1.1: 49.3%, AutomationBench v1.0.6: 33.2%. 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 Sol and Phi 4 Reasoning Plus?

GPT-6 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 Sol and Phi 4 Reasoning Plus?

Key differences include LLM Stats Score (49.4 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 Sol and Phi 4 Reasoning Plus?

GPT-6 Sol is developed by OpenAI and Phi 4 Reasoning Plus is developed by Microsoft.

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