Model comparison

Seed 2.0 Pro vs Step 3.7 Flash

Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 36.5 on the Noometry Index. Step 3.7 Flash costs 2.7× less per token, which makes it the better buy when Seed 2.0 Pro's lead doesn't matter for your workload.

Last verified October 10, 2026. 1 shared benchmarks.

Seed 2.0 Pro

ByteDance Seed

42.5

Rank #97 Confirmed

Step 3.7 Flash

StepFun

36.5

Rank #207 Reported

Summary

They share 1 benchmark with published results for both. Seed 2.0 Pro scores higher in 2 categories and Step 3.7 Flash in 1 category; 3 gaps are clear of the uncertainty.
The widest gap is in math, where Step 3.7 Flash leads 40.9 to 36.5.
The biggest single-benchmark swing is NYT Connections (extended): 28.4% for Seed 2.0 Pro and 39.7% for Step 3.7 Flash.
Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $0.50 / $3 for Seed 2.0 Pro.
Step 3.7 Flash has downloadable open weights; the other is API-only.

Side by side

Seed 2.0 Pro and Step 3.7 Flash specifications
	Seed 2.0 Pro	Step 3.7 Flash
Provider	ByteDance Seed	StepFun
Noometry Index	42.5	36.5
Released	2026-02-14	2026-05-29
Weights	Proprietary	Open
Context window	256K	256K
Max output	128K	256K
Input $ / M tokens	$0.50	$0.18
Output $ / M tokens	$3	$1.11
Results tracked	20	5

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Category by category

Coding Seed 2.0 Pro leads

Seed 2.0 Pro: 42.9 (#84), Step 3.7 Flash: 39.4 (#147)

Coding benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
SciCode	—	40%
LMArena Coding	1472	—
ALE-Bench	—	694.12

Reasoning Seed 2.0 Pro leads

Seed 2.0 Pro: 23.1 (#167), Step 3.7 Flash: 20.9 (#211)

Reasoning benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
NYT Connections (extended)	28.4%	39.7%
CritPt	—	2.3%
Thematic Generalization	57.1%	—
LMArena Hard Prompts	1453	—

Math Step 3.7 Flash leads

Seed 2.0 Pro: 36.5 (#110), Step 3.7 Flash: 40.9 (#74)

Math benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
MathArena Final-Answer Competitions	—	68.5%
LMArena Math	1440	—

Knowledge Not comparable

Seed 2.0 Pro: 39.6 (#119), Step 3.7 Flash: —

Knowledge benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
LMArena Expert	1440	—

Multimodal Not comparable

Seed 2.0 Pro: 40.8 (#34), Step 3.7 Flash: —

Multimodal benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
LMArena Vision	1275	—

Multilingual Not comparable

Seed 2.0 Pro: 54.8 (#37), Step 3.7 Flash: —

Multilingual benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
LMArena Non-English	1442	—
LMArena Chinese	1490	—
LMArena French	1470	—
LMArena German	1443	—
LMArena Japanese	1408	—
LMArena Korean	1412	—
LMArena Russian	1450	—
LMArena Spanish	1460	—

Instruction Following Not comparable

Seed 2.0 Pro: 74.7 (#86), Step 3.7 Flash: —

Instruction Following benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
LMArena Instruction Following	1414	—

Long Context Not comparable

Seed 2.0 Pro: 43.6 (#85), Step 3.7 Flash: —

Long Context benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
LMArena Longer Query	1428	—

Writing & Preference Not comparable

Seed 2.0 Pro: 63.0 (#66), Step 3.7 Flash: —

Writing & Preference benchmarks
Benchmark	Seed 2.0 Pro	Step 3.7 Flash
LMArena Text	1448	—
LMArena Creative Writing	1406	—
LMArena Multi-Turn	1441	—

Frequently asked questions

Is Seed 2.0 Pro better than Step 3.7 Flash?

Which is cheaper, Seed 2.0 Pro or Step 3.7 Flash?

Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; Seed 2.0 Pro lists at $0.50 and $3.

Is Seed 2.0 Pro or Step 3.7 Flash better for coding?

Seed 2.0 Pro scores higher on coding benchmarks: 42.9 versus 39.4 in the Noometry coding category.

Which has the bigger context window?

Both accept 256K tokens.

How many benchmarks do Seed 2.0 Pro and Step 3.7 Flash share?

1 benchmark has published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and Step 3.7 Flash has 5.