Model comparison

Seed 2.0 Pro vs GPT-5.3 Codex

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 42.5 on the Noometry Index. Seed 2.0 Pro costs 4.3× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

Last verified October 10, 2026. 0 shared benchmarks.

Seed 2.0 Pro

ByteDance Seed

42.5

Rank #97 Confirmed

GPT-5.3 Codex OpenAI

45.5

Rank #61 Reported

Summary

The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 42.9.
Seed 2.0 Pro is cheaper at $0.50 / $3 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
GPT-5.3 Codex accepts more context: 400K tokens versus 256K.

Side by side

Seed 2.0 Pro and GPT-5.3 Codex specifications
	Seed 2.0 Pro	GPT-5.3 Codex
Provider	ByteDance Seed	OpenAI
Noometry Index	42.5	45.5
Released	2026-02-14	2026-02-05
Weights	Proprietary	Proprietary
Context window	256K	400K
Max output	128K	128K
Input $ / M tokens	$0.50	$1.75
Output $ / M tokens	$3	$14
Results tracked	20	8

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Category by category

Coding GPT-5.3 Codex leads

Seed 2.0 Pro: 42.9 (#84), GPT-5.3 Codex: 48.5 (#51)

Coding benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
SWE-bench Verified	—	74.8%
LMArena WebDev	—	1408
WeirdML	—	79.3%
LMArena Coding	1472	—
ALE-Bench	—	1,655

Agentic & Tool Use Not comparable

Seed 2.0 Pro: —, GPT-5.3 Codex: 47.8 (#9)

Agentic & Tool Use benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
Terminal-Bench	—	78.4%
METR Time Horizons	—	74.5%
Vending-Bench 2	—	5,940

Reasoning Not comparable

Seed 2.0 Pro: 23.1 (#167), GPT-5.3 Codex: —

Reasoning benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
NYT Connections (extended)	28.4%	—
Thematic Generalization	57.1%	—
LMArena Hard Prompts	1453	—
Epoch Capabilities Index	—	156.84

Math Not comparable

Seed 2.0 Pro: 36.5 (#110), GPT-5.3 Codex: —

Math benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
LMArena Math	1440	—

Knowledge Not comparable

Seed 2.0 Pro: 39.6 (#119), GPT-5.3 Codex: —

Knowledge benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
LMArena Expert	1440	—

Multimodal Not comparable

Seed 2.0 Pro: 40.8 (#34), GPT-5.3 Codex: —

Multimodal benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
LMArena Vision	1275	—

Multilingual Not comparable

Seed 2.0 Pro: 54.8 (#37), GPT-5.3 Codex: —

Multilingual benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
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), GPT-5.3 Codex: —

Instruction Following benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
LMArena Instruction Following	1414	—

Long Context Not comparable

Seed 2.0 Pro: 43.6 (#85), GPT-5.3 Codex: —

Long Context benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
LMArena Longer Query	1428	—

Writing & Preference Not comparable

Seed 2.0 Pro: 63.0 (#66), GPT-5.3 Codex: —

Writing & Preference benchmarks
Benchmark	Seed 2.0 Pro	GPT-5.3 Codex
LMArena Text	1448	—
LMArena Creative Writing	1406	—
LMArena Multi-Turn	1441	—

Frequently asked questions

Is Seed 2.0 Pro better than GPT-5.3 Codex?

Which is cheaper, Seed 2.0 Pro or GPT-5.3 Codex?

Seed 2.0 Pro is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.

Is Seed 2.0 Pro or GPT-5.3 Codex better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 42.9 in the Noometry coding category.

Which has the bigger context window?

GPT-5.3 Codex does, with 400K tokens against 256K.

How many benchmarks do Seed 2.0 Pro and GPT-5.3 Codex share?

0 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and GPT-5.3 Codex has 8.