GPT-5.6 Terra Pro vs GLM 5 Turbo

GPT-5.6 Terra Pro at $1.15 in and $6.90 out and GLM 5 Turbo at $1.38 in and $4.60 out — per million tokens, from the same wallet.

GPT-5.6 Terra Pro

OpenAI

1.1¢

for a client proposal

$1.15 in · $6.90 out / 1M

1.05M context · released 1 month ago

Full page →

GLM 5 Turbo

Z.ai

1.1¢

for a client proposal

$1.38 in · $4.60 out / 1M

203K context · released 5 months ago

Full page →

Asking all both at once — identical prompt, identical context — costs about 2.2¢ for a typical client proposal.

At a glance

Cheapest input: GPT-5.6 Terra Pro at $1.15 per million tokens.
Cheapest output: GLM 5 Turbo at $4.60 per million tokens.
Largest context: GPT-5.6 Terra 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 Terra Pro

0.57¢

GLM 5 Turbo

0.51¢

Draft a client proposal from notes

5K in · 800 out

GPT-5.6 Terra Pro

1.1¢

GLM 5 Turbo

1.1¢

Context-heavy session (Alyph workspace)

155K in · 4K out

GPT-5.6 Terra Pro

$0.21

GLM 5 Turbo

$0.23

Analyze a 50-page legal contract

35K in · 1K out

GPT-5.6 Terra Pro

4.7¢

GLM 5 Turbo

$0.05

Large architecture refactor

250K in · 3K out

GPT-5.6 Terra Pro

$0.31

GLM 5 Turbo

needs 250K ctx

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 Terra Pro

GLM 5 Turbo

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

Pricing

GPT-5.6 Terra Pro

GLM 5 Turbo

Input / 1M tokens

$1.15

$1.38

Output / 1M tokens

$6.90

$4.60

Cached input / 1M

$0.115

$0.276

Web search

0.57¢ / search

—

Specs

GPT-5.6 Terra Pro

GLM 5 Turbo

Provider

OpenAI

Z.ai

Released

1 month ago

5 months ago

Context window

1.05M

203K

Max output

128K

131K

Input

Files, Images, and Text

Text

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

2026-02-16

—

Try it with real numbers

2K tokens in · 500 tokens out.

GPT-5.6 Terra Pro

OpenAI

0.57¢

for this task

40% input · 60% output

Full pricing →

GLM 5 Turbo

Z.ai

0.51¢

for this task

55% input · 45% output

Full pricing →

All 2, same prompt and context: 1.1¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 462 of these.

Which should you pick?

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

On price, GLM 5 Turbo is the cheapest of the two on a typical task, at about 1.1¢.

For images or files, GPT-5.6 Terra Pro can read them directly; GLM 5 Turbo is text-only.

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 Terra Pro pricing →GLM 5 Turbo pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, GPT-5.6 Terra Pro or GLM 5 Turbo?

On a typical client proposal (5K tokens in, 800 out): GLM 5 Turbo at 1.1¢; GPT-5.6 Terra Pro at 1.1¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

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

Can I run GPT-5.6 Terra Pro and GLM 5 Turbo 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 2.2¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 2.2¢ for a typical client proposal. Free to start, with $5 of credit.