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GPT-5.5 Pro vs GPT-4o-mini

Detailed technical comparison between GPT-5.5 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-5.5 Pro: 6 WinsvsGPT-4o-mini: 0 Wins
Context Leader

GPT-5.5 Pro

1,050,000 tokens
Agentic Tool-Calling

GPT-5.5 Pro

98/100 Score
Lowest Latency (TTFT)

GPT-4o-mini

150 ms TTFT
Input Price Leader

GPT-4o-mini

$0.15 / MTok
OpenAIactive

GPT-5.5 Pro

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...

View GPT-5.5 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-5.5 ProGPT-4o-mini
ProviderOpenAIOpenAI
Context Window1,050,000 tokens🏆128,000 tokens
Agent Suitability98/100 (est.)🏆82/100 (est.)
Time to First Token (TTFT)450 ms (est.)150 ms (est.)🏆
Deployment Modelmanaged apimanaged api
Production StabilityBeta Access (est.)Stable GA (est.)
API AvailableYesYes
Released Date2026-04-242024-07-18

API Pricing Comparison

Input Price per Million Tokens

GPT-5.5 Pro

$30.00

GPT-4o-mini

$0.15

Output Price per Million Tokens

GPT-5.5 Pro

$180.00

GPT-4o-mini

$0.60

💡 Cost Ratio: GPT-4o-mini is 200.0x cheaper per input token than GPT-5.5 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
96.5%vs82.0%+14.5% GPT-5.5 Pro
GPT-5.5 Pro 🏆
GPT-4o-mini
HumanEvalPython coding & logic synthesis
98.2%vs84.0%+14.2% GPT-5.5 Pro
GPT-5.5 Pro 🏆
GPT-4o-mini
MATHComplex mathematical problem solving
96.0%vs70.2%+25.8% GPT-5.5 Pro
GPT-5.5 Pro 🏆
GPT-4o-mini
GPQAGraduate-level expert reasoning
89.1%vs45.0%+44.1% GPT-5.5 Pro
GPT-5.5 Pro 🏆
GPT-4o-mini
HellaSwagCommonsense reasoning and inference
99.4%vs84.7%+14.7% GPT-5.5 Pro
GPT-5.5 Pro 🏆
GPT-4o-mini
MT-BenchMulti-turn conversation flow quality
9.9%vs8.6%+1.3% GPT-5.5 Pro
GPT-5.5 Pro 🏆
GPT-4o-mini

GPT-5.5 Pro Quirks & Gotchas

  • ▸Best-in-class instruction following for complex agentic chains
  • ▸Premium pricing — use GPT-5 for cost-sensitive workloads

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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