Which is cheaper: OpenAI GPT-4o or GPT-5.6 Sol?

OpenAI GPT-4o is cheaper at $2.50/1M input tokens compared to $8.00/1M for GPT-5.6 Sol.

Which model has lower latency: OpenAI GPT-4o or GPT-5.6 Sol?

OpenAI GPT-4o delivers faster response times with an average TTFT of 280ms vs 420ms for GPT-5.6 Sol.

OpenAI GPT-4o vs GPT-5.6 Sol: Cost, Latency & Coding Benchmark (2026)

Which model is better: OpenAI GPT-4o or GPT-5.6 Sol?

OpenAI GPT-4o is 68.8% cheaper for input tokens ($2.50 vs. $8.00 per 1M tokens) and $10.00 vs. $32.00 for output tokens (3.2x cost difference). In terms of operational performance, OpenAI GPT-4o delivers faster response latency with 280ms TTFT (140ms faster than GPT-5.6 Sol). GPT-5.6 Sol leads coding benchmarks at 79.5% SWE-bench vs. 38.8% for OpenAI GPT-4o.

Verified daily via automated API latency tests and official documentation.

Zero-Shot RAG Verified

Verified Performance & Unit Economics Delta

Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.

Metric / Dimension	OpenAI GPT-4o	GPT-5.6 Sol	Net Delta / Advantage
Input Cost / 1M Tokens	$2.50	$8.00	OpenAI GPT-4o is 3.2x cheaper
Output Cost / 1M Tokens	$10.00	$32.00	OpenAI GPT-4o (68.8% lower)
Avg TTFT Response Latency	280ms	420ms	OpenAI GPT-4o (+140ms faster)
SWE-bench Verified (Coding)	38.8%	79.5%	GPT-5.6 Sol (+40.7% lead)
Inference Value Score (IVR)	45.5 / 100	35.3 / 100	OpenAI GPT-4o (+10.2 pts)

Interactive Monthly Token Economics & ROI Forecaster

Model your expected production workload across prompt (input) and completion (output) tokens.

Live Calculation Engine

Monthly Input Tokens (Prompts / Context) 10.0M Tokens

100K 50M 250M 500M+

Monthly Output Tokens (Completions / Responses) 2.5M Tokens

100K 10M 50M 100M+

Precise Input (Millions)

Precise Output (Millions)

Estimated Monthly Spend

OpenAI GPT-4o $5.45

$2.5/1M in · $10/1M out

GPT-5.6 Sol $67.50

$8/1M in · $32/1M out

Projected Monthly Cost Reduction

$62.05 / mo

(91.9% lower cost)

When to Choose OpenAI GPT-4o

Choose OpenAI GPT-4o when you need General multimodal assistant applications, consumer chat interfaces, and enterprise knowledge workers. and have an infrastructure budget aligned with $2.50/1M tokens.

Explore all OpenAI GPT-4o provider endpoints →

When to Choose GPT-5.6 Sol

Choose GPT-5.6 Sol when you need High-order STEM research, autonomous enterprise executive workflow coordination, and heavy deep-reasoning pipelines. and prioritize OpenAI ecosystem integration at $8.00/1M tokens.

Explore all GPT-5.6 Sol provider endpoints →