Kimi K3 vs Beam 1.0 501B A23B

Beam 1.0 501B A23B costs 13.6x less per output token than Kimi K3 ($1.10 vs $15.00 per million). Updated October 21, 2026; 28 benchmarks have a result for both.

Replace Kimi K3 Replace Beam 1.0 501B A23B

Kimi K3Moonshot AI

Coding: 62.3
Overall: 66.5
Output $/M: $15.00

R Beam 1.0 501B A23BReflection

Coding: No data
Overall: No data
Output $/M: $1.10

vs boards won of 28 shared

Kimi K3 or Beam 1.0 501B A23B: which to pick

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; Beam 1.0 501B A23B has none, so the two cannot be ranked on coding.

Pick Beam 1.0 501B A23B for output tokens 13.6x cheaper ($1.10 vs $15.00 per million).

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task Model BBeam 1.0 501B A23BReflectionNot benchmarked1 independent benchmarkNo cost per solved task

2889

Shared results: 28
Kimi K3 only: 89
Beam 1.0 501B A23B only: 0
Like-for-like categories: 6 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

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 Kimi K3 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
No call
Only Kimi K3 has a AA Intelligence Index result, 43.6.
Directional only
Agentic work
AA Agentic Index
No call
Only Kimi K3 has a AA Agentic Index result, 50.0.
Directional only
Reasoning
GPQA Diamond
No call
Only Kimi K3 has a GPQA Diamond result, 92.9%.
Directional only
Knowledge
MMLU Pro
No call
Only Kimi K3 has a MMLU Pro result, 88.0%.
Directional only
Web design
Design Arena: websites
Kimi K3
Kimi K3 leads, 1335 against 1253.
Same board, both measured
General
Vals Index
No call
Only Kimi K3 has a Vals Index result, 53.0%.
Directional only
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Beam 1.0 501B A23B
Kimi K3 $0.011, Beam 1.0 501B A23B $0.0009 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Kimi K3 has the number, $0.81.
Directional only

At a glance

Coding index: Kimi K3 62.3 from 6 benchmarks, Beam 1.0 501B A23B not benchmarked.
Widest category: Coding, 19.4 points apart on average over 5 shared benchmarks.
Widest single gap: LMArena WebDev: Kimi K3 1655 against Beam 1.0 501B A23B 1437, 31.2 points apart on a 0 to 100 scale.
Output price: Kimi K3 $15.00 against Beam 1.0 501B A23B $1.10 per million output tokens, 13.6x apart.
Context window: Both take 1.05M tokens.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	Kimi K3	Bars	Beam 1.0 501B A23B	Ties
Coding	5		0
Reasoning	3		0
Math	2		0
Knowledge	4		0
Web design	2		0
General	12		0
All shared boards	28		0

CodingLike-for-likeSix of these boards feed the Vibe Coding Index50

Coding benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
LiveBench coding	59.3%	Not measured	Only Kimi K3 measured
LMArena WebDev	1655	1437	Kimi K3
AA Coding Index	76.2	Not measured	Only Kimi K3 measured
LiveCodeBench (Vals AI)	87.2%	Not measured	Only Kimi K3 measured
SWE-bench Verified (Vals AI)	93.4%	Not measured	Only Kimi K3 measured
Terminal-Bench 4 (Vals AI)	17.2%	Not measured	Only Kimi K3 measured
Vibe Code Bench (Vals AI)	85.0%	Not measured	Only Kimi K3 measured
Code migration (Vals AI)	16.1%	Not measured	Only Kimi K3 measured
ProgramBench (Vals AI)	2.0%	Not measured	Only Kimi K3 measured
IOI (Vals AI)	48.9%	Not measured	Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)	80.9%	Not measured	Only Kimi K3 measured
SWE-bench Multimodal (Vals AI)	44.2%	Not measured	Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)	18.2%	Not measured	Only Kimi K3 measured
CyberBench (Vals AI)	75.2%	Not measured	Only Kimi K3 measured
SciCode	59.5%	Not measured	Only Kimi K3 measured
FrontierCode	44.2%	Not measured	Only Kimi K3 measured
FrontierSWE	25.9%	Not measured	Only Kimi K3 measured
WeirdML	82.6%	Not measured	Only Kimi K3 measured
ALE-Bench	1524.5	Not measured	Only Kimi K3 measured
LMArena Text: coding	1508	1473	Kimi K3
LMArena Text: software and IT	1499	1461	Kimi K3
LMArena WebDev: React	1670	1443	Kimi K3
LMArena WebDev: HTML	1644	1436	Kimi K3
LMArena WebDev: from an image	1579	Not measured	Only Kimi K3 measured
Neither model has a result on the other 15 boards here

IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared

Intelligence benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
AA Intelligence Index	43.6	Not measured	Only Kimi K3 measured
Epoch Capabilities Index	157.9	Not measured	Only Kimi K3 measured

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index24 boards, none shared

Agentic work benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
AA Agentic Index	50.0	Not measured	Only Kimi K3 measured
Design Arena: agents building web apps	1295	Not measured	Only Kimi K3 measured
Design Arena: agents building full-stack apps	1315	Not measured	Only Kimi K3 measured
Design Arena: agents building mobile apps	1269	Not measured	Only Kimi K3 measured
Design Arena: agents building Android apps	1250	Not measured	Only Kimi K3 measured
Design Arena: agents building Godot games	1223	Not measured	Only Kimi K3 measured
Design Arena: agents building games	1252	Not measured	Only Kimi K3 measured
Design Arena: HTML slides	1256	Not measured	Only Kimi K3 measured
Design Arena: PowerPoint slides	1273	Not measured	Only Kimi K3 measured
Design Arena: spreadsheets	1058	Not measured	Only Kimi K3 measured
LiveBench research	79.0%	Not measured	Only Kimi K3 measured
LiveBench browser	16.0%	Not measured	Only Kimi K3 measured
LiveBench long agentic	42.8%	Not measured	Only Kimi K3 measured
Finance Agent (Vals AI)	53.1%	Not measured	Only Kimi K3 measured
Tax Agent Bench (Vals AI)	33.4%	Not measured	Only Kimi K3 measured
Legal Research Bench (Vals AI)	46.1%	Not measured	Only Kimi K3 measured
Harvey's Legal Agent Benchmark (Vals AI)	12.9%	Not measured	Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)	66.7%	Not measured	Only Kimi K3 measured
BioMysteryBench (Vals AI)	72.6%	Not measured	Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)	1.4%	Not measured	Only Kimi K3 measured
Time Horizon Index (Vals AI)	10.5%	Not measured	Only Kimi K3 measured
APEX-Agents	47.8%	Not measured	Only Kimi K3 measured
PostTrainBench	32.0%	Not measured	Only Kimi K3 measured
Vending-Bench 2	$5,165	Not measured	Only Kimi K3 measured
Neither model has a result on the other 17 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index30

Reasoning benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
GPQA Diamond	92.9%	Not measured	Only Kimi K3 measured
LiveBench reasoning	90.7%	Not measured	Only Kimi K3 measured
MMMU Pro (Vals AI)	88.2%	Not measured	Only Kimi K3 measured
GPQA Diamond (Artificial Analysis run)	93.5%	Not measured	Only Kimi K3 measured
Humanity's Last Exam (Artificial Analysis run)	46.9%	Not measured	Only Kimi K3 measured
GPQA Diamond (Epoch AI run)	93.1%	Not measured	Only Kimi K3 measured
ARC-AGI	94.5%	Not measured	Only Kimi K3 measured
ARC-AGI-2	60.4%	Not measured	Only Kimi K3 measured
SimpleBench	60.7%	Not measured	Only Kimi K3 measured
Chess puzzles	37.0%	Not measured	Only Kimi K3 measured
Mystery game puzzles	26.0%	Not measured	Only Kimi K3 measured
LMArena Text: hard prompts	1495	1442	Kimi K3
LMArena Text: expert	1520	1447	Kimi K3
LMArena Text: hard prompts in English	1496	1451	Kimi K3
Neither model has a result on the other 8 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index20

Math benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
OTIS Mock AIME	97.2%	Not measured	Only Kimi K3 measured
FrontierMath, tiers 1 to 3	72.2%	Not measured	Only Kimi K3 measured
FrontierMath, tier 4	39.0%	Not measured	Only Kimi K3 measured
ProofBench	87.0%	Not measured	Only Kimi K3 measured
LMArena Text: math	1494	1459	Kimi K3
LMArena Text: mathematical work	1505	1475	Kimi K3
Neither model has a result on the other 7 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40

Knowledge benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
MMLU Pro	88.0%	Not measured	Only Kimi K3 measured
LegalBench (Vals AI)	86.2%	Not measured	Only Kimi K3 measured
CorpFin (Vals AI)	71.6%	Not measured	Only Kimi K3 measured
TaxEval (Vals AI)	75.7%	Not measured	Only Kimi K3 measured
MortgageTax (Vals AI)	66.3%	Not measured	Only Kimi K3 measured
MedCode (Vals AI)	49.4%	Not measured	Only Kimi K3 measured
SimpleQA Verified	50.6%	Not measured	Only Kimi K3 measured
LMArena Text: science	1508	1430	Kimi K3
LMArena Text: medicine and healthcare	1489	1376	Kimi K3
LMArena Text: legal and government	1503	1433	Kimi K3
LMArena Text: business and finance	1470	1430	Kimi K3
Neither model has a result on the other 7 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index20

Web design benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
Design Arena: websites	1335	1253	Kimi K3
Design Arena: UI components	1344	Not measured	Only Kimi K3 measured
Design Arena: game dev	1359	1233	Kimi K3
Design Arena: data viz	1351	Not measured	Only Kimi K3 measured
Design Arena: 3D	1388	Not measured	Only Kimi K3 measured
Design Arena: all code categories	1360	Not measured	Only Kimi K3 measured
Design Arena: SVG	1302	Not measured	Only Kimi K3 measured
LiveBench design	77.2%	Not measured	Only Kimi K3 measured
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index120

General benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
Vals Index	53.0%	Not measured	Only Kimi K3 measured
LiveBench data analysis	78.7%	Not measured	Only Kimi K3 measured
Public Benefits Bench (Vals AI)	68.2%	Not measured	Only Kimi K3 measured
SAGE (Vals AI)	52.8%	Not measured	Only Kimi K3 measured
MedScribe (Vals AI)	88.0%	Not measured	Only Kimi K3 measured
Vals Multimodal Index	73.4%	Not measured	Only Kimi K3 measured
Long context reasoning (AA-LCR)	88.7%	Not measured	Only Kimi K3 measured
DTBench	91.2%	Not measured	Only Kimi K3 measured
LMCA	52.7%	Not measured	Only Kimi K3 measured
Surface Evolver Bench	95.0%	Not measured	Only Kimi K3 measured
Furniture assembly	34.2%	Not measured	Only Kimi K3 measured
LMArena Text	1476	1425	Kimi K3
LMArena Text: instruction following	1485	1430	Kimi K3
LMArena Text: creative writing	1457	1390	Kimi K3
LMArena Text: English	1481	1436	Kimi K3
LMArena Text: non-English	1466	1413	Kimi K3
LMArena Text: Chinese	1529	1424	Kimi K3
LMArena Text: German	1490	Not measured	Only Kimi K3 measured
LMArena Text: Japanese	1494	Not measured	Only Kimi K3 measured
LMArena Text: Korean	1460	Not measured	Only Kimi K3 measured
LMArena Text: French	1492	1461	Kimi K3
LMArena Text: Spanish	1472	Not measured	Only Kimi K3 measured
LMArena Text: Russian	1485	1412	Kimi K3
LMArena Text: Polish	1458	Not measured	Only Kimi K3 measured
LMArena Text: multi-turn	1489	1414	Kimi K3
LMArena Text: longer queries	1494	1429	Kimi K3
LMArena Text: writing and language	1471	1400	Kimi K3
LMArena Text: entertainment and media	1453	1399	Kimi K3
Neither model has a result on the other 18 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Kimi K3 and Beam 1.0 501B A23B
Benchmark	Kimi K3	Beam 1.0 501B A23B	Leader
Neither model has a result on 5 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

Kimi K3$0.011Fits in one request

Beam 1.0 501B A23B$0.0009Fits in one request

Beam 1.0 501B A23B costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request

Beam 1.0 501B A23B$0.021Fits in one request

Beam 1.0 501B A23B costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request

Beam 1.0 501B A23B$0.081Fits in one request

Beam 1.0 501B A23B 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 Kimi K3 and Beam 1.0 501B A23B
Specification	MoonshotAI Kimi K3	Reflection Beam 1.0 501B A23B
Maker	Moonshot AI	Reflection
Weights	Open weights	Open weights
Released	July 16, 2026	October 16, 2026
Context window	1.05M	1.05M
Input $/Mtok	$3.00	$0.35
Output $/Mtok	$15.00	$1.10
Coding index	62.3	Not benchmarked
Independent measurements behind it	6	1
Cost per solved task	$0.81	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is Kimi K3 better than Beam 1.0 501B A23B for coding?

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; Beam 1.0 501B A23B has none, so the two cannot be ranked on coding. Pick Beam 1.0 501B A23B for output tokens 13.6x cheaper ($1.10 vs $15.00 per million).

Which is cheaper, Kimi K3 or Beam 1.0 501B A23B?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Beam 1.0 501B A23B costs $0.35 and $1.10. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Kimi K3 or Beam 1.0 501B A23B?

Neither: both take 1.05M tokens.

How many benchmarks is the Kimi K3 vs Beam 1.0 501B A23B comparison based on?

28 benchmarks have a result for both models as of October 21, 2026. Kimi K3's coding index rests on 6 independent benchmarks and Beam 1.0 501B A23B's on 1. Where only one model has a result, the page says so instead of naming a winner.

Kimi K3 or Beam 1.0 501B A23B: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Knowledge

Web design

General

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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