Question 1

Is GPT-4o cheaper than GPT-5.6 Sol?

Accepted Answer

Yes, GPT-4o is cheaper for the typical workload above. At $2.50/1M input and $10.00/1M output tokens, it costs $3.2500 versus $8.5000 for GPT-5.6 Sol — a 62% difference. Note that GPT-5.6 Sol switches to long-context pricing above 272K prompt tokens, so for very long prompts this gap does not scale linearly.

Question 2

What is the context window of GPT-4o vs GPT-5.6 Sol?

Accepted Answer

GPT-4o supports a 128K token context window. GPT-5.6 Sol supports a 1.1M token context window. A larger context window lets you include more text — documents, conversation history, or code — in a single API call.

Question 3

Do GPT-4o or GPT-5.6 Sol support context caching or batch discounts?

Accepted Answer

GPT-4o does not support context caching. GPT-5.6 Sol supports context caching with a 90% discount on cached tokens.

Question 4

Do GPT-4o and GPT-5.6 Sol use the same tokenizer?

Accepted Answer

Yes, both GPT-4o and GPT-5.6 Sol use the o200k_base (tiktoken). The same text produces identical token counts on both models, so any cost difference is purely due to the rate each provider charges per token.

Question 5

How much does 1 million tokens cost with GPT-4o vs GPT-5.6 Sol?

Accepted Answer

GPT-4o (OpenAI): $2.5 input / $10 output per 1M tokens. GPT-5.6 Sol (OpenAI): $5 input / $30 output per 1M tokens. Rates shown before caching or batch discounts.

Question 6

Which is cheaper for output-heavy workloads — GPT-4o or GPT-5.6 Sol?

Accepted Answer

For an 80% output / 20% input workload (typical for code generation or long-form writing), GPT-4o costs $8.5000 per 1M total tokens and GPT-5.6 Sol costs $25.0000. GPT-4o is 66% cheaper for this pattern. For your exact ratio, use the calculator to get a precise breakdown.

Question 7

How much text can GPT-4o and GPT-5.6 Sol process in one API call?

Accepted Answer

GPT-4o has a 128K-token context window — approximately 96K words or ~384 pages of standard text. GPT-5.6 Sol has a 1.1M-token context window — approximately 788K words or ~3K pages. Estimates assume roughly 0.75 words per token.

Feature	GPT-4o	GPT-5.6 Sol
Provider	OpenAI	OpenAI
Input (per 1M tokens)	$2.50	$5.00
Output (per 1M tokens)	$10.00	$30.00
Long-context pricing	Flat rate at any prompt size	Over 272K tokens: $10.00 in / $45.00 out
Context caching	No	Yes — 90% off cached tokens
Batch API discount	50% off	50% off
Context window	128K tokens	1.1M tokens
Tokenizer	o200k_base (tiktoken)	o200k_base (tiktoken)

GPT-4o vs GPT-5.6 Sol — Side-by-side pricing

Side-by-side pricing

Real-world cost example

Frequently asked questions

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