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GPT-5.1 vs GPT-4o-mini

Detailed technical comparison between GPT-5.1 (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-5.1: 6 WinsvsGPT-4o-mini: 0 Wins
Context Leader

GPT-5.1

400,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

GPT-4o-mini

$0.15 / MTok
OpenAIactive

GPT-5.1

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...

View GPT-5.1 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-5.1GPT-4o-mini
ProviderOpenAIOpenAI
Context Window400,000 tokens🏆128,000 tokens
Agent SuitabilityN/A82/100
Time to First Token (TTFT)N/A150 ms
Deployment Modelmanaged apimanaged api
Production Stabilitystablestable
API AvailableYesYes
Released Date2025-11-132024-07-18

API Pricing Comparison

Input Price per Million Tokens

GPT-5.1

$1.25

GPT-4o-mini

$0.15

Output Price per Million Tokens

GPT-5.1

$10.00

GPT-4o-mini

$0.60

💡 Cost Ratio: GPT-4o-mini is 8.3x cheaper per input token than GPT-5.1.

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
93.2%vs82.0%+11.2% GPT-5.1
GPT-5.1 🏆
GPT-4o-mini
HumanEvalPython coding & logic synthesis
94.4%vs84.0%+10.4% GPT-5.1
GPT-5.1 🏆
GPT-4o-mini
MATHComplex mathematical problem solving
81.6%vs70.2%+11.4% GPT-5.1
GPT-5.1 🏆
GPT-4o-mini
GPQAGraduate-level expert reasoning
56.6%vs45.0%+11.6% GPT-5.1
GPT-5.1 🏆
GPT-4o-mini
HellaSwagCommonsense reasoning and inference
88.8%vs84.7%+4.1% GPT-5.1
GPT-5.1 🏆
GPT-4o-mini
MT-BenchMulti-turn conversation flow quality
9.1%vs8.6%+0.5% GPT-5.1
GPT-5.1 🏆
GPT-4o-mini

GPT-5.1 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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