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GPT-5.6 Sol Pro vs GPT-4o-mini

Detailed technical comparison between GPT-5.6 Sol Pro (OpenAI) and GPT-4o-mini (OpenAI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

GPT-5.6 Sol Pro: 6 WinsvsGPT-4o-mini: 0 Wins
Context Leader

GPT-5.6 Sol Pro

1,050,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

GPT-4o-mini

$0.15 / MTok
OpenAIactive

GPT-5.6 Sol Pro

GPT-5.6 Sol Pro is the same underlying model as [GPT-5.6 Sol](https://openrouter.ai/openai/gpt-5.6-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

View GPT-5.6 Sol Pro Full Specs →
OpenAIactive

GPT-4o-mini

GPT-4o mini is OpenAI's newest model after [GPT-4 Omni](/models/openai/gpt-4o), supporting both text and image inputs with text outputs. As their most advanced small model, it is many multiples more affordable...

View GPT-4o-mini Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-5.6 Sol ProGPT-4o-mini
ProviderOpenAIOpenAI
Context Window1,050,000 tokens🏆128,000 tokens
Agent SuitabilityN/A82/100
Time to First Token (TTFT)N/A150 ms
Deployment Modelmanaged apimanaged api
Production Stabilitybetastable
API AvailableYesYes
Released Date2026-07-092024-07-18

API Pricing Comparison

Input Price per Million Tokens

GPT-5.6 Sol Pro

$5.00

GPT-4o-mini

$0.15

Output Price per Million Tokens

GPT-5.6 Sol Pro

$30.00

GPT-4o-mini

$0.60

💡 Cost Ratio: GPT-4o-mini is 33.3x cheaper per input token than GPT-5.6 Sol Pro.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
93.4%vs82.0%+11.4% GPT-5.6 Sol Pro
GPT-5.6 Sol Pro 🏆
GPT-4o-mini
HumanEvalPython coding & logic synthesis
94.6%vs84.0%+10.6% GPT-5.6 Sol Pro
GPT-5.6 Sol Pro 🏆
GPT-4o-mini
MATHComplex mathematical problem solving
78.4%vs70.2%+8.2% GPT-5.6 Sol Pro
GPT-5.6 Sol Pro 🏆
GPT-4o-mini
GPQAGraduate-level expert reasoning
56.8%vs45.0%+11.8% GPT-5.6 Sol Pro
GPT-5.6 Sol Pro 🏆
GPT-4o-mini
HellaSwagCommonsense reasoning and inference
89.0%vs84.7%+4.3% GPT-5.6 Sol Pro
GPT-5.6 Sol Pro 🏆
GPT-4o-mini
MT-BenchMulti-turn conversation flow quality
9.2%vs8.6%+0.6% GPT-5.6 Sol Pro
GPT-5.6 Sol Pro 🏆
GPT-4o-mini

GPT-5.6 Sol Pro Quirks & Gotchas

No developer gotchas reported.

GPT-4o-mini Quirks & Gotchas

  • ▸Ultra-low latency — best TTFT in the OpenAI lineup
  • ▸Tool calling limited to single-step — not suitable for complex agentic pipelines

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