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Phi 4 vs GPT 5.6 Sol

At a glance
MicrosoftPhi 4

Microsoft's compact research model with strong STEM reasoning.

6516K ctx$0.07/$0.14 per M#61/92
OpenAIGPT 5.6 Sol

OpenAI's GPT-5.6 flagship — built for complex reasoning, agentic coding, and long-running professional work.

1.1M ctx$5.00/$30.00 per M
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
MicrosoftPhi 4
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper
Capability
CapabilityECI64.6
Reasoning & Knowledge
Graduate Science56.1%
Math
Math Problems64.9%Competition Math13.8%
Agentic
Terminal Tasks—
OpenAIGPT 5.6 Sol
Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-11
Capability
Capability—
Reasoning & Knowledge
Graduate Science94.6%
Math
Math Problems—Competition Math—
Agentic
Terminal Tasks88.8%
Specs
MicrosoftPhi 4
16K
Context
16K
Max output
Jan 2025
Released
OpenAIGPT 5.6 Sol
1.1M
Context
128K
Max output
Jul 2026
Released
Capabilities
MicrosoftPhi 4
Vision
Audio
Reasoning
OpenAIGPT 5.6 Sol
Vision
Audio
Reasoning
Pricing
MicrosoftPhi 4
Live pricing, shown before you run
Input$0.07/M tokens
Output$0.14/M tokens
OpenAIGPT 5.6 Sol
Live pricing, shown before you run
Input$5.00/M tokens
Output$30.00/M tokens
Cache read$0.50/M tokens
Web search$0.01/search
Chat with Phi 4Go to model
Chat with GPT 5.6 SolGo to model
Frequently Asked Questions: Phi 4 vs GPT 5.6 Sol▼

Which is better, Phi 4 or GPT 5.6 Sol?

▼

Both Phi 4 and GPT 5.6 Sol are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Phi 4 or GPT 5.6 Sol?

▼

Phi 4 has a lower blended cost. Phi 4: $0.07 input / $0.14 output. GPT 5.6 Sol: $5.00 input / $30.00 output.

Which has a larger context window, Phi 4 or GPT 5.6 Sol?

▼

GPT 5.6 Sol has a larger context window: Phi 4 supports 16K tokens vs GPT 5.6 Sol at 1.1M tokens.

Do both Phi 4 and GPT 5.6 Sol support vision?

▼

GPT 5.6 Sol supports vision/image input, but Phi 4 does not.

What are the key differences between Phi 4 and GPT 5.6 Sol?

▼

Key differences: Phi 4 is significantly cheaper; only GPT 5.6 Sol supports vision input; only GPT 5.6 Sol offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Phi 4 and GPT 5.6 Sol for free on idapt.app to see which performs better for your specific needs.

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