gpt-oss-20b vs Llama 3 8B Lunaris

gpt-oss-20b at $0.035 in and $0.149 out and Llama 3 8B Lunaris at $0.046 in and $0.058 out — per million tokens, from the same wallet.

gpt-oss-20b

OpenAI

0.03¢

for a client proposal

$0.035 in · $0.149 out / 1M

131K context · released August 2025

Full page →

Llama 3 8B Lunaris

Sao10k

0.03¢

for a client proposal

$0.046 in · $0.058 out / 1M

8K context · released August 2024

Full page →

Asking all both at once — identical prompt, identical context — costs about 0.06¢ for a typical client proposal.

At a glance

Cheapest input: gpt-oss-20b at $0.035 per million tokens.
Cheapest output: Llama 3 8B Lunaris at $0.058 per million tokens.
Largest context: gpt-oss-20b at 131K tokens — about 190 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-oss-20b

0.01¢

Llama 3 8B Lunaris

0.01¢

Draft a client proposal from notes

5K in · 800 out

gpt-oss-20b

0.03¢

Llama 3 8B Lunaris

0.03¢

Context-heavy session (Alyph workspace)

155K in · 4K out

gpt-oss-20b

needs 155K ctx

Llama 3 8B Lunaris

needs 155K ctx

Analyze a 50-page legal contract

35K in · 1K out

gpt-oss-20b

0.14¢

Llama 3 8B Lunaris

needs 35K ctx

Large architecture refactor

250K in · 3K out

gpt-oss-20b

needs 250K ctx

Llama 3 8B Lunaris

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-oss-20b

Llama 3 8B Lunaris

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

Pricing

gpt-oss-20b

Llama 3 8B Lunaris

Input / 1M tokens

$0.035

$0.046

Output / 1M tokens

$0.149

$0.058

Cached input / 1M

$0.035

—

Specs

gpt-oss-20b

Llama 3 8B Lunaris

Provider

OpenAI

Sao10k

Released

August 2025

August 2024

Context window

131K

Max output

131K

16K

Input

Text

Output

Text

Reasoning

Shows its thinking

Answers directly

Knowledge cutoff

2024-06-30

2023-12-31

Try it with real numbers

2K tokens in · 500 tokens out.

gpt-oss-20b

OpenAI

0.01¢

for this task

48% input · 52% output

Full pricing →

Llama 3 8B Lunaris

Sao10k

0.01¢

for this task

76% input · 24% output

Full pricing →

All 2, same prompt and context: 0.03¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 18,903 of these.

Which should you pick?

For long documents, gpt-oss-20b has the largest context window here — 131K tokens.

On price, Llama 3 8B Lunaris is the cheapest of the two on a typical task, at about 0.03¢.

If you want to watch the model think, gpt-oss-20b 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-oss-20b pricing →Llama 3 8B Lunaris pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, gpt-oss-20b or Llama 3 8B Lunaris?

On a typical client proposal (5K tokens in, 800 out): Llama 3 8B Lunaris at 0.03¢; gpt-oss-20b at 0.03¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

gpt-oss-20b — 131K tokens, about 190 pages.

Can I run gpt-oss-20b and Llama 3 8B Lunaris 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 0.06¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 0.06¢ for a typical client proposal. Free to start, with $5 of credit.