GPT-5.6 Sol Pro vs GPT Chat Latest

GPT-5.6 Sol Pro at $5.75 in and $34.50 out and GPT Chat Latest at $5.75 in and $34.50 out — per million tokens, from the same wallet.

GPT-5.6 Sol Pro

OpenAI

$0.06

for a client proposal

$5.75 in · $34.50 out / 1M

1.05M context · released 1 month ago

Full page →

GPT Chat Latest

OpenAI

$0.06

for a client proposal

$5.75 in · $34.50 out / 1M

400K context · released 3 months ago

Full page →

Asking all both at once — identical prompt, identical context — costs about $0.11 for a typical client proposal.

At a glance

All 2 cost the same on input.
Largest context: GPT-5.6 Sol Pro at 1.05M tokens — about 1,500 pages.

Cost per task

Estimated totals at the rates above. Solid bar is input, lighter bar is output.

Quick code fix

2K in · 500 out

GPT-5.6 Sol Pro

2.9¢

GPT Chat Latest

2.9¢

Draft a client proposal from notes

5K in · 800 out

GPT-5.6 Sol Pro

$0.06

GPT Chat Latest

$0.06

Context-heavy session (Alyph workspace)

155K in · 4K out

GPT-5.6 Sol Pro

$1.03

GPT Chat Latest

$1.03

Analyze a 50-page legal contract

35K in · 1K out

GPT-5.6 Sol Pro

$0.24

GPT Chat Latest

$0.24

Large architecture refactor

250K in · 3K out

GPT-5.6 Sol Pro

$1.54

GPT Chat Latest

$1.54

Solid part of each bar is input tokens, the lighter part is output. Models that don’t fit a task are marked instead of priced.

Cost vs Token Amount

Drag the slider to adjust the split between input and output workload.

80% Input20% Output

GPT-5.6 Sol Pro

GPT Chat Latest

Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.

Pricing

GPT-5.6 Sol Pro

GPT Chat Latest

Input / 1M tokens

$5.75

Output / 1M tokens

$34.50

Cached input / 1M

$0.575

Web search

1.1¢ / search

Specs

GPT-5.6 Sol Pro

GPT Chat Latest

Provider

OpenAI

Released

1 month ago

3 months ago

Context window

1.05M

400K

Max output

128K

Input

Files, Images, and Text

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Answers directly

Knowledge cutoff

2026-02-16

—

Try it with real numbers

2K tokens in · 500 tokens out.

GPT-5.6 Sol Pro

OpenAI

2.9¢

for this task

40% input · 60% output

Full pricing →

GPT Chat Latest

OpenAI

2.9¢

for this task

40% input · 60% output

Full pricing →

All 2, same prompt and context: $0.06. That is the entire cost of the comparison.

Your $5 welcome credit covers about 86 of these.

Which should you pick?

For long documents, GPT-5.6 Sol Pro has the largest context window here — 1.05M tokens.

On price they are identical: about $0.06 for a typical task each.

If you want to watch the model think, GPT-5.6 Sol Pro shows reasoning; the other answers directly.

Or don’t pick. Send the identical prompt to all both, read the answers side by side, and keep the winner. How to run a fair bake-off →

GPT-5.6 Sol Pro pricing →GPT Chat Latest pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, GPT-5.6 Sol Pro or GPT Chat Latest?

On a typical client proposal (5K tokens in, 800 out) they cost the same — about $0.06 each. Compare them on context and capabilities instead.

Which has the largest context window?

GPT-5.6 Sol Pro — 1.05M tokens, about 1,500 pages.

Can I run GPT-5.6 Sol Pro and GPT Chat Latest side by side on Alyph?

Yes — that is what Alyph is built for: the identical prompt with identical context to all 2, answers rendered side by side, billed from one wallet. This exact combination costs about $0.11 for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about $0.11 for a typical client proposal. Free to start, with $5 of credit.