Gemini 3.1 Flash Lite Preview vs Grok 4.20 Multi-Agent

Gemini 3.1 Flash Lite Preview costs 1.7x less per output token than Grok 4.20 Multi-Agent ($1.50 vs $2.50 per million). Updated October 21, 2026; no benchmark has tested both models yet.

Replace Gemini 3.1 Flash Lite Preview Replace Grok 4.20 Multi-Agent

Gemini 3.1 Flash Lite PreviewGoogle

Coding: 22.7
Overall: 36.6
Output $/M: $1.50

Grok 4.20 Multi-AgentxAI

Coding: No data
Overall: No data
Output $/M: $2.50

vs $1.50 vs $2.50 per 1M output tokens. Gemini 3.1 Flash Lite Preview is 1.7x cheaper.

Gemini 3.1 Flash Lite Preview or Grok 4.20 Multi-Agent: which to pick

Only Gemini 3.1 Flash Lite Preview has a coding score, 22.7 on the Vibe Coding Index; Grok 4.20 Multi-Agent has none, so the two cannot be ranked on coding.

Pick Grok 4.20 Multi-Agent for a larger context window (2M against 1.05M tokens).

Model AGemini 3.1 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task Model BGrok 4.20 Multi-AgentxAINot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested both yet. Gemini 3.1 Flash Lite Preview has results on LMArena WebDev, AA Coding Index and LiveCodeBench (Vals AI); Grok 4.20 Multi-Agent has none yet. Compare them on price and context instead.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
No call
Only Gemini 3.1 Flash Lite Preview has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Intelligence Index result, 15.6.
Directional only
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Agentic Index result, 1.6.
Directional only
Reasoning
GPQA Diamond
No call
Only Gemini 3.1 Flash Lite Preview has a GPQA Diamond result, 81.1%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Flash Lite Preview has a MMLU Pro result, 86.2%.
Directional only
Web design
Design Arena: websites
No call
Only Gemini 3.1 Flash Lite Preview has a Design Arena: websites result, 1083.
Directional only
Long documents
Listed context window
Grok 4.20 Multi-Agent
Grok 4.20 Multi-Agent takes 2M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.0010, Grok 4.20 Multi-Agent $0.0025 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Flash Lite Preview has the number, $0.18.
Directional only

At a glance

Coding index: Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, Grok 4.20 Multi-Agent not benchmarked.
Widest category: None yet: no category has been tested on both models.
Widest single gap: None yet: no benchmark has tested both models.
Output price: Gemini 3.1 Flash Lite Preview $1.50 against Grok 4.20 Multi-Agent $2.50 per million output tokens, 1.7x apart.
Context window: Gemini 3.1 Flash Lite Preview takes 1.05M tokens, Grok 4.20 Multi-Agent 2M.

Benchmark by benchmark

Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.

CodingDirectional onlySix of these boards feed the Vibe Coding Index15 boards measured

Coding benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
LMArena WebDev	1257	Not measured	Only Gemini 3.1 Flash Lite Preview measured
AA Coding Index	34.7	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LiveCodeBench (Vals AI)	80.1%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
SWE-bench Verified (Vals AI)	62.8%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Vibe Code Bench (Vals AI)	0.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Code migration (Vals AI)	4.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
ProgramBench (Vals AI)	0.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Terminal-Bench 2.1 (Vals AI)	34.1%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
ALE-Bench	797.7	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: coding	1400	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: software and IT	1413	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: React	1245	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: HTML	1276	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: from an image	1336	Not measured	Only Gemini 3.1 Flash Lite Preview measured
SciCode	4.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 24 boards here

IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured

Intelligence benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
AA Intelligence Index	15.6	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 1 board here

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index5 boards measured

Agentic work benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
AA Agentic Index	1.6	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Finance Agent (Vals AI)	30.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Tax Agent Bench (Vals AI)	3.1%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Legal Research Bench (Vals AI)	3.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Excel Modeling Benchmark (Vals AI)	8.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 36 boards here

ReasoningDirectional onlyPublic boards, shown as published, kept out of the index7 boards measured

Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
GPQA Diamond	81.1%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
MMMU Pro (Vals AI)	82.5%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: hard prompts	1407	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: expert	1398	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: hard prompts in English	1403	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: diagrams	1242	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: homework	1271	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 15 boards here

MathDirectional onlyPublic boards, shown as published, kept out of the index3 boards measured

Math benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
AIME	83.3%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: math	1428	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: mathematical work	1417	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 10 boards here

KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index12 boards measured

Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
MMLU Pro	86.2%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LegalBench (Vals AI)	83.8%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
CaseLaw (Vals AI)	55.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)	59.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
TaxEval (Vals AI)	71.8%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
MortgageTax (Vals AI)	68.0%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
MedCode (Vals AI)	47.6%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: science	1425	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: medicine and healthcare	1428	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: legal and government	1418	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: business and finance	1389	Not measured	Only Gemini 3.1 Flash Lite Preview measured
FACTS Benchmark Suite	51.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 6 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards measured

Web design benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
Design Arena: websites	1083	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: UI components	1072	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: game dev	1029	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: data viz	1045	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: 3D	1048	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: all code categories	1072	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: SVG	1052	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Design Arena: ASCII art	1167	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 1 board here

GeneralDirectional onlyPublic boards, shown as published, kept out of the index28 boards measured

General benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Benchmark	Gemini 3.1 Flash Lite Preview	Grok 4.20 Multi-Agent	Leader
SAGE (Vals AI)	49.5%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
MedScribe (Vals AI)	63.9%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Vals Multimodal Index	41.4%	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text	1416	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: instruction following	1377	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: creative writing	1401	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision	1240	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: English	1414	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: non-English	1410	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Chinese	1460	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: German	1430	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Japanese	1413	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Korean	1392	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: French	1424	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Spanish	1421	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Russian	1420	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: Polish	1443	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: multi-turn	1417	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: longer queries	1394	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: writing and language	1408	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: entertainment and media	1386	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: English	1232	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: Chinese	1278	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: reading text	1246	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: humor	1266	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: captioning	1259	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing things	1308	Not measured	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writing	1248	Not measured	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 18 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3.1 Flash Lite Preview$0.0010Fits in one request

Grok 4.20 Multi-Agent$0.0025Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Repository review

50K input + 3K output tokens

Gemini 3.1 Flash Lite Preview$0.017Fits in one request

Grok 4.20 Multi-Agent$0.070Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Agent loop

200K input + 10K output tokens

Gemini 3.1 Flash Lite Preview$0.065Fits in one request

Grok 4.20 Multi-Agent$0.275Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent
Specification	Google Gemini 3.1 Flash Lite Preview	SpaceXAI Grok 4.20 Multi-Agent
Maker	Google	xAI
Weights	No public weights listed	No public weights listed
Released	March 3, 2026	March 31, 2026
Context window	1.05M	2M
Input $/Mtok	$0.25	$1.25
Output $/Mtok	$1.50	$2.50
Coding index	22.7	Not benchmarked
Independent measurements behind it	3	0
Cost per solved task	$0.18	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is Gemini 3.1 Flash Lite Preview better than Grok 4.20 Multi-Agent for coding?

Only Gemini 3.1 Flash Lite Preview has a coding score, 22.7 on the Vibe Coding Index; Grok 4.20 Multi-Agent has none, so the two cannot be ranked on coding. Pick Grok 4.20 Multi-Agent for a larger context window (2M against 1.05M tokens).

Which is cheaper, Gemini 3.1 Flash Lite Preview or Grok 4.20 Multi-Agent?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Grok 4.20 Multi-Agent costs $1.25 and $2.50. Cost per solved task is known for Gemini 3.1 Flash Lite Preview only.

Which has the bigger context window, Gemini 3.1 Flash Lite Preview or Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent, with 2M tokens against 1.05M.

Has any benchmark tested both Gemini 3.1 Flash Lite Preview and Grok 4.20 Multi-Agent?

Gemini 3.1 Flash Lite Preview or Grok 4.20 Multi-Agent: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

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