API cost decision in 10 seconds

Grok 4.20 vs Lyria 3 Pro Preview

Pick Lyria 3 Pro Preview for lower cost; pick Grok 4.20 only if the larger context window matters more.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T12:43:06Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Lyria 3 Pro Preview for lower cost; pick Grok 4.20 only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Lyria 3 Pro Preview is estimated at $0 vs $2.5 for Grok 4.20, saving $2.5 (100% lower).

Cost-first pickLyria 3 Pro Preview

Context-first pickGrok 4.20

Sample savings$2.5100%

10x traffic gap$25

Grok 4.20 has more context, but Lyria 3 Pro Preview saves $2.5 on the standard workload. At 10x that traffic, the same price gap is about $25. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Lyria 3 Pro Preview stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Grok 4.20	Lyria 3 Pro Preview
Input-heavy / RAG	5M input + 500K output	Lyria 3 Pro Preview	$7.5	$0
Balanced workload	1M input + 1M output	Lyria 3 Pro Preview	$3.75	$0
Output-heavy chatbot	1M input + 5M output	Lyria 3 Pro Preview	$13.75	$0

Cheaper input Lyria 3 Pro Preview $1.25 vs $0 / 1M

Lyria 3 Pro Preview is free for input tokens while Grok 4.20 costs $1.25 per 1M tokens.

Cheaper output Lyria 3 Pro Preview $2.5 vs $0 / 1M

Lyria 3 Pro Preview is free for output tokens while Grok 4.20 costs $2.5 per 1M tokens.

Larger context Grok 4.20 2M vs 1.05M

Grok 4.20 has 951.42K more context (1.91x larger).

Sample workload Lyria 3 Pro Preview $2.5 vs $0

Lyria 3 Pro Preview is free for the standard workload while the other model is estimated at $2.5.

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Grok 4.20 Calculating… Estimated API cost

Lyria 3 Pro Preview Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Lyria 3 Pro Preview has the lower input price; Lyria 3 Pro Preview has the lower output price; Grok 4.20 offers the larger context window. For the 1M input plus 500K output sample, Lyria 3 Pro Preview is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2.5 for Grok 4.20 and $0 for Lyria 3 Pro Preview.

Best Fit

Choose Grok 4.20 when you care most about larger context window.

Choose Lyria 3 Pro Preview when you care most about lower input-token price, and lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Lyria 3 Pro Preview is estimated at $0 vs $2.5 for Grok 4.20, saving $2.5 (100% lower).
Lyria 3 Pro Preview is free for the standard workload while the other model is estimated at $2.5.
Lyria 3 Pro Preview is free for input tokens while Grok 4.20 costs $1.25 per 1M tokens.
Lyria 3 Pro Preview is free for output tokens while Grok 4.20 costs $2.5 per 1M tokens.
Grok 4.20 has 951.42K more context (1.91x larger).

Head-to-Head Specs

Feature	Grok 4.20 (xAI)	Lyria 3 Pro Preview (Google)
Input Price prompt tokens per 1M	$1.25	$0
Completion Price per 1M tokens	$2.5	$0
Sample Workload Cost 1M input + 500K output	$2.5	$0
Context Window	2M	1.05M
Release Date	2026-03-31	2026-03-30

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Lyria 3 Pro Preview	On the standard 1M input plus 500K output workload, Lyria 3 Pro Preview is estimated at $0 vs $2.5 for Grok 4.20, saving $2.5 (100% lower).
High-volume input processing	Lyria 3 Pro Preview	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Lyria 3 Pro Preview	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Grok 4.20	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Grok Build 0.1 can replace Grok 4.20 when lower sample workload cost matters most: $2.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.

Popular competitors

DeepSeek V4 Flash · DeepSeek · #1
Hy3 preview · Tencent · #2
Claude Opus 4.7 · Anthropic · #3
Claude Sonnet 4.6 · Anthropic · #4

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