Llama 3.3 70B Instruct vs Step 3.5 Flash vs Grok 4.20

Llama 3.3 70B Instruct at $0.115 in and $0.368 out, Step 3.5 Flash at $0.115 in and $0.345 out, and Grok 4.20 at $1.44 in and $2.88 out — per million tokens, from the same wallet.

Llama 3.3 70B Instruct

At a glance

Cheapest input: Llama 3.3 70B Instruct at $0.115 per million tokens.
Cheapest output: Step 3.5 Flash at $0.345 per million tokens.
Largest context: Grok 4.20 at 2M tokens — about 2,900 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

Llama 3.3 70B Instruct

0.04¢

Step 3.5 Flash

0.04¢

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

Llama 3.3 70B Instruct

0.09¢

Step 3.5 Flash

0.09¢

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Llama 3.3 70B Instruct

needs 155K ctx

Step 3.5 Flash

1.9¢

Grok 4.20

$0.23

Analyze a 50-page legal contract

35K in · 1K out

Llama 3.3 70B Instruct

0.44¢

Step 3.5 Flash

0.44¢

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

Llama 3.3 70B Instruct

needs 250K ctx

Step 3.5 Flash

3¢

Grok 4.20

$0.74

Long-context rate applied at this input size.

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

Llama 3.3 70B Instruct

Step 3.5 Flash

Grok 4.20

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

Pricing

Llama 3.3 70B Instruct

Step 3.5 Flash

Grok 4.20

Input / 1M tokens

$0.115

$1.44

Output / 1M tokens

$0.368

$0.345

$2.88

Cached input / 1M

—

$0.230

Web search

—

0.57¢ / search

Specs

Llama 3.3 70B Instruct

Step 3.5 Flash

Grok 4.20

Provider

Try it with real numbers

2K tokens in · 500 tokens out.

Llama 3.3 70B Instruct

Which should you pick?

For long documents, Grok 4.20 has the largest context window here — 2M tokens.

On price, Step 3.5 Flash is the cheapest of the three on a typical task, at about 0.09¢.

For images or files, Grok 4.20 can read them directly; Llama 3.3 70B Instruct and Step 3.5 Flash are text-only.

If you want to watch the model think, Step 3.5 Flash and Grok 4.20 show reasoning; the other answers directly.

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

Llama 3.3 70B Instruct pricing →Step 3.5 Flash pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — Llama 3.3 70B Instruct, Step 3.5 Flash, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): Step 3.5 Flash at 0.09¢; Llama 3.3 70B Instruct at 0.09¢; Grok 4.20 at 0.95¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

Grok 4.20 — 2M tokens, about 2,900 pages.

Can I run Llama 3.3 70B Instruct, Step 3.5 Flash, and Grok 4.20 side by side on Alyph?

Yes — that is what Alyph is built for: the identical prompt with identical context to all 3, answers rendered side by side, billed from one wallet. This exact combination costs about 1.1¢ for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about 1.1¢ for a typical client proposal. Free to start, with $5 of credit.