Model comparison

GPT-5.6 Terra vs Qwen3.5 Plus

GPT-5.6 Terra is the stronger model overall, scoring 59.2 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 5.0× less per token, which makes it the better buy when GPT-5.6 Terra's lead doesn't matter for your workload.

Last verified October 10, 2026. 10 shared benchmarks.

GPT-5.6 Terra OpenAI

59.2

Rank #17 Confirmed

Qwen3.5 Plus

Alibaba (Qwen)

42.9

Rank #106 Confirmed

Summary

They share 10 benchmarks with published results for both. GPT-5.6 Terra scores higher in 4 categories and Qwen3.5 Plus in 0 categories; 4 gaps are clear of the uncertainty.
The widest gap is in math, where GPT-5.6 Terra leads 81.6 to 49.6.
The biggest single-benchmark swing is Chess Puzzles: 54% for GPT-5.6 Terra and 22% for Qwen3.5 Plus.
Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $2 / $12 for GPT-5.6 Terra.
GPT-5.6 Terra accepts more context: 1.05M tokens versus 1M.

Side by side

GPT-5.6 Terra and Qwen3.5 Plus specifications
	GPT-5.6 Terra	Qwen3.5 Plus
Provider	OpenAI	Alibaba (Qwen)
Noometry Index	59.2	42.9
Released	2026-07-09	2026-02-16
Weights	Proprietary	Proprietary
Context window	1.05M	1M
Max output	128K	66K
Input $ / M tokens	$2	$0.40
Output $ / M tokens	$12	$2.40
Results tracked	52	15

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

GPT-5.6 Terra: 57.7 (#19), Qwen3.5 Plus: —

Coding benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
ALE-Bench	1,951	621.92
DeepSWE	69.6%	—
FrontierCode	41.3%	—
CursorBench	41.3%	—
LMArena WebDev	1522	—
SciCode	55%	—
WeirdML	78.3%	—
LMArena Coding	1484	—

Agentic & Tool Use Not comparable

GPT-5.6 Terra: 40.1 (#25), Qwen3.5 Plus: —

Agentic & Tool Use benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
Vending-Bench 2	7,343	0.54
APEX-Agents	58.2%	—
BALROG	53.2%	—
GDP.pdf	24.7%	—

Reasoning GPT-5.6 Terra leads

GPT-5.6 Terra: 60.7 (#21), Qwen3.5 Plus: 32.8 (#74)

Reasoning benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
Chess Puzzles	54%	22%
Mystery Game Puzzles	35%	17%
DTBench	93.3%	80.5%
LMCA	55%	36.4%
Epoch Capabilities Index	159.62	146.78
ARC-AGI-2	83.9%	—
SimpleBench	48.9%	—
Kagi LLM Benchmark	51.3%	—
NYT Connections (extended)	78.4%	—
ARC-AGI-1	96.5%	—
CritPt	30%	—
LMArena Hard Prompts	1468	—
Surface Evolver Bench	83.8%	—

Math GPT-5.6 Terra leads

GPT-5.6 Terra: 81.6 (#12), Qwen3.5 Plus: 49.6 (#61)

Math benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
OTIS Mock AIME 2024-2025	99.7%	86.7%
FrontierMath (Tiers 1-3)	86%	—
FrontierMath Tier 4	70.7%	—
ProofBench	74%	—
LMArena Math	1466	—
FrontierMath (Feb 2025 set)	—	21%
FrontierMath Tier 4 (v1)	—	2.1%

Knowledge GPT-5.6 Terra leads

GPT-5.6 Terra: 61.2 (#30), Qwen3.5 Plus: 46.0 (#83)

Knowledge benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
GPQA Diamond	93.3%	84.8%
SimpleQA Verified	43.2%	25.4%
Vectara Hallucination Rate	—	10.7%
LMArena Expert	1492	—

Multimodal Not comparable

GPT-5.6 Terra: 47.3 (#11), Qwen3.5 Plus: —

Multimodal benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
LMArena Vision	1271	—
Blueprint-Bench 2	30.8%	—
Furniture Assembly	54.2%	—
LMArena Document	1472	—

Multilingual Not comparable

GPT-5.6 Terra: 54.4 (#44), Qwen3.5 Plus: —

Multilingual benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
LMArena Non-English	1439	—
LMArena Chinese	1513	—
LMArena French	1471	—
LMArena German	1460	—
LMArena Japanese	1457	—
LMArena Korean	1425	—
LMArena Russian	1450	—
LMArena Spanish	1448	—

Instruction Following Not comparable

GPT-5.6 Terra: 76.4 (#40), Qwen3.5 Plus: —

Instruction Following benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
LMArena Instruction Following	1454	—

Long Context GPT-5.6 Terra leads

GPT-5.6 Terra: 44.4 (#68), Qwen3.5 Plus: 43.0 (#113)

Long Context benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
CL-bench	—	19.8%
CL-bench Life	—	12.4%
LMArena Longer Query	1451	—

Writing & Preference Not comparable

GPT-5.6 Terra: 70.2 (#23), Qwen3.5 Plus: —

Writing & Preference benchmarks
Benchmark	GPT-5.6 Terra	Qwen3.5 Plus
LMArena Text	1447	—
LMArena Creative Writing	1410	—
EQ-Bench Creative Writing	1855	—
EQ-Bench 4	1234	—
LMArena Multi-Turn	1449	—

Frequently asked questions

Is GPT-5.6 Terra better than Qwen3.5 Plus?

Which is cheaper, GPT-5.6 Terra or Qwen3.5 Plus?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; GPT-5.6 Terra lists at $2 and $12.

Which has the bigger context window?

GPT-5.6 Terra does, with 1.05M tokens against 1M.

How many benchmarks do GPT-5.6 Terra and Qwen3.5 Plus share?

10 benchmarks have published results for both models. GPT-5.6 Terra has 52 scored results on Noometry and Qwen3.5 Plus has 15.