All models

Muse Spark 1.1 vs GPT-5.6 Terra

Muse Spark 1.1 at $1.44 in and $4.89 out and GPT-5.6 Terra at $1.15 in and $6.90 out — per million tokens, from the same wallet.

M

Muse Spark 1.1

Meta

1.1¢

for a client proposal

$1.44 in · $4.89 out / 1M

1.05M context · released 3 weeks ago

Full page →

GPT-5.6 Terra

OpenAI

1.1¢

for a client proposal

$1.15 in · $6.90 out / 1M

1.05M context · released 1 month 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 at $1.15 per million tokens.
  • Cheapest output: Muse Spark 1.1 at $4.89 per million tokens.
  • Largest context: GPT-5.6 Terra 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
Muse Spark 1.1
0.53¢
GPT-5.6 Terra
0.57¢

Draft a client proposal from notes

5K in · 800 out
Muse Spark 1.1
1.1¢
GPT-5.6 Terra
1.1¢

Context-heavy session (Alyph workspace)

155K in · 4K out
Muse Spark 1.1
$0.24
GPT-5.6 Terra
$0.21

Analyze a 50-page legal contract

35K in · 1K out
Muse Spark 1.1
$0.06
GPT-5.6 Terra
4.7¢

Large architecture refactor

250K in · 3K out
Muse Spark 1.1
$0.37
GPT-5.6 Terra
$0.31

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
free$1.95$3.910 tokens250k500k750k1000k
Muse Spark 1.1
GPT-5.6 Terra

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

Pricing

Muse Spark 1.1
GPT-5.6 Terra
Input / 1M tokens
$1.44
$1.15
Output / 1M tokens
$4.89
$6.90
Cached input / 1M
$0.172
$0.115
Web search
0.29¢ / search
0.57¢ / search

Specs

Muse Spark 1.1
GPT-5.6 Terra
Provider
Meta
OpenAI
Released
3 weeks ago
1 month ago
Context window
1.05M
1.05M
Max output
—
128K
Input
Text, Images, Video, Files, and Audio
Files, Images, and Text
Output
Text
Text
Reasoning
Shows its thinking
Shows its thinking
Knowledge cutoff
—
2026-02-16

Try it with real numbers

2K tokens in · 500 tokens out.

Muse Spark 1.1

Meta

0.53¢

for this task

54% input · 46% output

Full pricing →

GPT-5.6 Terra

OpenAI

0.57¢

for this task

40% input · 60% 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 451 of these.

Which should you pick?

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

On price, Muse Spark 1.1 is the cheapest of the two on a typical task, at about 1.1¢.

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 →

Muse Spark 1.1 pricing →GPT-5.6 Terra pricing →Add Lyria 3 Clip PreviewAdd Grok 4.20

Questions, answered

Which is cheaper, Muse Spark 1.1 or GPT-5.6 Terra?

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

Which has the largest context window?

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

Can I run Muse Spark 1.1 and GPT-5.6 Terra 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.

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