GLM-5.3 vs GPT-5.6 Terra

Updated September 28, 2026. Rank says GPT-5.6 Terra is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.

Decision reading

GPT-5.6 Terra has the higher public score estimate, 72.58 versus 65.44, but the 90% score intervals overlap. Treat that as a lead, not a settled winner. 11 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.

Model A

GLM-5.3

Z.AI

65.44/100

Estimated · Public rank #27

90% interval 59.7–71.2

Model B

GPT-5.6 Terra

OpenAI

72.58/100

Supported · Public rank #10

90% interval 68.3–76.8

Shared results: 11
GLM-5.3 only: 13
GPT-5.6 Terra only: 22
Like-for-like categories: 3 / 8

Estimated: GLM-5.3 · Supported: GPT-5.6 TerraHow the comparison works

Which one for your work

Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.

Coding work
Code generation, repair, and software-engineering tasks
GPT-5.6 Terra
GPT-5.6 Terra leads on the public coding lane, 64.2 to 56.7, with Supported evidence for both models, although the 90% intervals overlap.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
GLM-5.3
GLM-5.3 leads on the public agentic lane, 67.3 to 59.3, with Supported evidence for both models, although the 90% intervals overlap.
Confidence: limited
Long documents
Prompts that approach the documented context limit
GPT-5.6 Terra
GPT-5.6 Terra has the larger documented context window.
Confidence: documented

Show secondary and unsupported calls

Chat turn cost
1K fresh input + 500 output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
Repository review cost
50K fresh input + 3K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates

Which one for a specific job

Choose a job from the LLM Selector's task catalog to see the category row it rests on, under the same basis rules as the table below. A directional row stays directional; choosing a job never creates a winner.

Pick the job you would use them for

The same task catalog as the LLM Selector. Each job names the evidence surface it rests on; nothing here adds a new score.

56.7GLM-5.364.2GPT-5.6 Terra

Like-for-like · BenchAlign v5.7

GPT-5.6 Terra leads the like-for-like coding row, although the 90% intervals overlap.

Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.

Open the coding leaderboard Shortlist models for this job

Same basis rules as the category table below

Shape of the matched evidence

Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.

Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.

LiveCodeBench (Vals)Coding
Normalized gap 5.4
GLM-5.3:80.5%
GPT-5.6 Terra:85.9%
GLM-5.3 source GPT-5.6 Terra source
MMLU-Pro (Vals)Knowledge
Normalized gap 0.1
GLM-5.3:86.8%
GPT-5.6 Terra:86.7%
GLM-5.3 source GPT-5.6 Terra source

Bars run 0–100 on each benchmark’s normalized display scale

Category results, on a stated basis

Each row shows the public-lane category score for both models: the BenchAlign v5.7 lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.

Agentic

Like-for-like

GLM-5.3: 67.3; Supported · #9/111
GPT-5.6 Terra: 59.3; Supported · #19/111
Basis: BenchAlign v5.7 lane · 9 vs 9 public rows
Reading: GLM-5.3 leads · intervals overlap

Coding

Like-for-like

GLM-5.3: 56.7; Supported · #22/136
GPT-5.6 Terra: 64.2; Supported · #8/136
Basis: BenchAlign v5.7 lane · 13 vs 9 public rows
Reading: GPT-5.6 Terra leads · intervals overlap

Knowledge

Like-for-like

GLM-5.3: 61.9; Supported · #33/160
GPT-5.6 Terra: 71.1; Supported · #10/160
Basis: BenchAlign v5.7 lane · 2 vs 8 public rows
Reading: GPT-5.6 Terra leads · intervals overlap

Reasoning

Directional only

GLM-5.3: 77.1; #11/27
GPT-5.6 Terra: 65.5; #18/27
Basis: Provisional lane · 0 vs 2 weighted rows
Reading: Directional only

Multimodal

Not comparable

GLM-5.3: Not ranked
GPT-5.6 Terra: 78.2; #16/50
Basis: Provisional lane · 0 vs 1 weighted rows
Reading: Not comparable

Multilingual

Not comparable

GLM-5.3: Not ranked
GPT-5.6 Terra: Not ranked
Basis: Provisional lane · 0 vs 0 weighted rows
Reading: Not comparable

Instruction following

Not comparable

GLM-5.3: Not ranked
GPT-5.6 Terra: 85.7; #35/124
Basis: Provisional lane · 0 vs 0 weighted rows
Reading: Not comparable

Math

Not comparable

GLM-5.3: Not ranked
GPT-5.6 Terra: 96.8; Unranked · 3 rankable rows
Basis: Provisional lane · 0 vs 2 weighted rows
Reading: Not comparable

Category scores with the server-provided evidence basis for GLM-5.3 and GPT-5.6 Terra
Category	GLM-5.3	GPT-5.6 Terra	Basis	Reading
Agentic	67.3Supported · #9/111	59.3Supported · #19/111	Like-for-likeBenchAlign v5.7 lane · 9 vs 9 public rows	GLM-5.3 leads · intervals overlap
Coding	56.7Supported · #22/136	64.2Supported · #8/136	Like-for-likeBenchAlign v5.7 lane · 13 vs 9 public rows	GPT-5.6 Terra leads · intervals overlap
Knowledge	61.9Supported · #33/160	71.1Supported · #10/160	Like-for-likeBenchAlign v5.7 lane · 2 vs 8 public rows	GPT-5.6 Terra leads · intervals overlap
Reasoning	77.1#11/27	65.5#18/27	Directional onlyProvisional lane · 0 vs 2 weighted rows	Directional only
Multimodal	Not ranked	78.2#16/50	Not comparableProvisional lane · 0 vs 1 weighted rows	Not comparable
Multilingual	Not ranked	Not ranked	Not comparableProvisional lane · 0 vs 0 weighted rows	Not comparable
Instruction following	Not ranked	85.7#35/124	Not comparableProvisional lane · 0 vs 0 weighted rows	Not comparable
Math	Not ranked	96.8Unranked · 3 rankable rows	Not comparableProvisional lane · 0 vs 2 weighted rows	Not comparable

Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.7) differ from the provisional-lane categories. Unranked scores sit on the provisional lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.

Supported evidence per lane · bars run 0–100Methodology

What each workload costs

Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.

Chat turn

1K fresh input + 500 output tokens

GLM-5.3: Self-hosted; infrastructure cost varies; Fits in one request
GPT-5.6 Terra: $0.008; Fits in one request

GLM-5.3 has no comparable published API token rate.

Repository review

50K fresh input + 3K output tokens

GLM-5.3: Self-hosted; infrastructure cost varies; Fits in one request
GPT-5.6 Terra: $0.136; Fits in one request

GLM-5.3 has no comparable published API token rate.

Cache-heavy agent loop

200K cached + 20K fresh input + 10K output tokens

GLM-5.3: Self-hosted; infrastructure cost varies; Fits in one request; Cached-input rate unavailable
GPT-5.6 Terra: $0.2; Fits in one request

GLM-5.3 has no comparable published API token rate.

Cached input falls back to the list input rate only where a cached rate is unpublished

Specification differences

Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.

SpecificationGLM-5.3GPT-5.6 Terra

Context window

Maximum documented context; output-token limits may be lower.

GLM-5.3

Z.AI GLM-5.3 model card

GPT-5.6 Terra

1.05M

OpenAI model catalog

API model ID

GLM-5.3

zai-org/GLM-5.3

Z.AI GLM-5.3 model card

GPT-5.6 Terra

gpt-5.6-terra

OpenAI model catalog

Cached-input rate

A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.

GLM-5.3

No comparable hosted API rate

Z.AI GLM-5.3 model card

GPT-5.6 Terra

$0.2 per 1M cached input tokens

OpenAI pricing

Documented inputs

GLM-5.3

Not sourced

GPT-5.6 Terra

text, image

OpenAI model catalog

Documented outputs

GLM-5.3

Not sourced

GPT-5.6 Terra

text

OpenAI model catalog

Provider availability

GLM-5.3

Not sourced

GPT-5.6 Terra

Generally Available · OpenAI Responses API

OpenAI model catalog

Reasoning profile

GLM-5.3

Reasoning

GPT-5.6 Terra

Reasoning

Weight access

GLM-5.3

Open Weight

GPT-5.6 Terra

Proprietary

License

GLM-5.3

Open Weight

GPT-5.6 Terra

Proprietary

Release date

GLM-5.3

2026-08-14

GPT-5.6 Terra

2026-07-09

If you already use one of these models

Deployment change: The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
Quality signal: GPT-5.6 Terra has the higher public score estimate, 72.58 versus 65.44, but the 90% score intervals overlap.
Workload cost: A complete comparable API-rate estimate is not available for both models.
Context tradeoff: GPT-5.6 Terra has the larger documented window (1.05M).

Run the same representative tasks against both endpoints before changing production traffic.

Questions

Which is better, GLM-5.3 or GPT-5.6 Terra?

GPT-5.6 Terra has the higher public score estimate, 72.58 versus 65.44, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.

Which is better for coding, GLM-5.3 or GPT-5.6 Terra?

GPT-5.6 Terra leads the public coding lane, 64.2 to 56.7, with Supported evidence for both models, although the 90% intervals overlap.

Which is better for agentic tasks, GLM-5.3 or GPT-5.6 Terra?

GLM-5.3 leads the public agentic tasks lane, 67.3 to 59.3, with Supported evidence for both models, although the 90% intervals overlap.

Which costs less, GLM-5.3 or GPT-5.6 Terra?

Both models do not have comparable published API token rates, so this page does not name a universal price winner.

Which has the larger context window, GLM-5.3 or GPT-5.6 Terra?

GPT-5.6 Terra has the larger documented context window: 1.05M, compared with 1M.

Benchmark evidence

The full public result ledger is available for audit without forcing a wide desktop table onto a phone.

Browse raw public benchmark evidence46 rows

Agentic

Terminal-Bench 2.1
GLM-5.388.2%
Source
GPT-5.6 Terra87.4%
Source
GLM-5.3 leads this result
terminalBench3
GLM-5.328.3%
Source
GPT-5.6 Terra—
Not directly comparable
CyberGym
GLM-5.384.5%
Source
GPT-5.6 Terra81.8%
Source
GLM-5.3 leads this result
ExploitGym
GLM-5.315.0%
Source
GPT-5.6 Terra23.2%
Source
GPT-5.6 Terra leads this result
Toolathlon-Verified
GLM-5.373.0%
Source
GPT-5.6 Terra—
Not directly comparable
AutomationBench
GLM-5.348.2%
Source
GPT-5.6 Terra—
Not directly comparable
Agents' Last Exam
GLM-5.328.5%
Source
GPT-5.6 Terra—
Not directly comparable
HLE w/ tools
GLM-5.362.5%
Source
GPT-5.6 Terra—
Not directly comparable
Terminal-Bench 2.1 (Vals)
GLM-5.371.5%
Source
GPT-5.6 Terra77.5%
Source
GPT-5.6 Terra leads this result
Terminal-Bench 3.0
GLM-5.3—
GPT-5.6 Terra20.8%
Source
Not directly comparable
BrowseComp
GLM-5.3—
GPT-5.6 Terra87.5%
Source
Not directly comparable
OSWorld 2.0
GLM-5.3—
GPT-5.6 Terra50.2%
Source
Not directly comparable
Toolathlon
GLM-5.3—
GPT-5.6 Terra53.1%
Source
Not directly comparable
ApprenticeBench
GLM-5.3—
GPT-5.6 Terra16%
Source
Not directly comparable

Coding

Terminal-Bench 2.1
GLM-5.388.2%
Source
GPT-5.6 Terra87.4%
Source
GLM-5.3 leads this result
terminalBench3
GLM-5.328.3%
Source
GPT-5.6 Terra—
Not directly comparable
DeepSWE
GLM-5.366.9%
Source
GPT-5.6 Terra69.6%
Source
GPT-5.6 Terra leads this result
NL2Repo
GLM-5.358%
Source
GPT-5.6 Terra—
Not directly comparable
ProgramBench
GLM-5.319.0%
Source
GPT-5.6 Terra—
Not directly comparable
FrontierSWE
GLM-5.378.1%
Source
GPT-5.6 Terra—
Not directly comparable
sweMarathon
GLM-5.342.5%
Source
GPT-5.6 Terra—
Not directly comparable
PostTrain Bench
GLM-5.339.8%
Source
GPT-5.6 Terra—
Not directly comparable
VulcanBench v3
Shared source
GLM-5.378.3%
GPT-5.6 Terra87.0%
GPT-5.6 Terra leads this result
OpenHarmony Bench
GLM-5.360.8%
Source
GPT-5.6 Terra—
Not directly comparable
FrontierSWE v2
GLM-5.330.2%
Source
GPT-5.6 Terra—
Not directly comparable
LiveCodeBench (Vals)
GLM-5.380.5%
Source
GPT-5.6 Terra85.9%
Source
GPT-5.6 Terra leads this result
SWE-bench (Vals)
GLM-5.395.4%
Source
GPT-5.6 Terra95.4%
Source
Tie
SWE-bench Pro
GLM-5.3—
GPT-5.6 Terra63.4%
Source
Not directly comparable
FrontierCode 1.1 Extended
GLM-5.3—
GPT-5.6 Terra55.8%
Source
Not directly comparable
cursorBench32
GLM-5.3—
GPT-5.6 Terra64.9%
Source
Not directly comparable
cursorBench40
GLM-5.3—
GPT-5.6 Terra41.3%
Source
Not directly comparable

Reasoning

ARC-AGI-2
GLM-5.3—
GPT-5.6 Terra83.9%
Source
Not directly comparable
ARC-AGI-3
GLM-5.3—
GPT-5.6 Terra0.8%
Source
Not directly comparable

Multimodal

MMMU-Pro
GLM-5.3—
GPT-5.6 Terra80.7%
Source
Not directly comparable
MMMU-Pro w/ Python
GLM-5.3—
GPT-5.6 Terra82%
Source
Not directly comparable

Knowledge

GPQA Diamond (Vals)
GLM-5.388.1%
Source
GPT-5.6 Terra90.9%
Source
GPT-5.6 Terra leads this result
MMLU-Pro (Vals)
GLM-5.386.8%
Source
GPT-5.6 Terra86.7%
Source
GLM-5.3 leads this result
GPQA
GLM-5.3—
GPT-5.6 Terra92.9%
Source
Not directly comparable
GPQA-D
GLM-5.3—
GPT-5.6 Terra92.9%
Source
Not directly comparable
HLE-Verified
GLM-5.3—
GPT-5.6 Terra51.1%
Source
Not directly comparable
LABBench2
GLM-5.3—
GPT-5.6 Terra81.2%
Source
Not directly comparable
HealthBench Professional
GLM-5.3—
GPT-5.6 Terra57.7%
Source
Not directly comparable
HealthBench Hard
GLM-5.3—
GPT-5.6 Terra32.7%
Source
Not directly comparable

Math

FrontierMath (legacy)
GLM-5.3—
GPT-5.6 Terra84.9%
Source
Not directly comparable
FrontierMath v2 (Tiers 1-3)
GLM-5.3—
GPT-5.6 Terra84.900%
Source
Not directly comparable
FrontierMath v2 (Tier 4)
GLM-5.3—
GPT-5.6 Terra68.300%
Source
Not directly comparable

46 public results · 11 shared

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Last updated September 28, 2026

GLM-5.3 vs GPT-5.6 Terra

Decision reading

Which one for your work

Coding work

Agentic work

Long documents

Chat turn cost

Cache-heavy agent loop cost

Repository review cost

Which one for a specific job

What is actually comparable

Shape of the matched evidence

Category results, on a stated basis

Agentic

Coding

Knowledge

Reasoning

Multimodal

Multilingual

Instruction following

Math

What each workload costs

Chat turn

Repository review

Cache-heavy agent loop

Specification differences

Context window

API model ID

Cached-input rate

Documented inputs

Documented outputs

Provider availability

Reasoning profile

Weight access

License

Release date

If you already use one of these models

Questions

Which is better, GLM-5.3 or GPT-5.6 Terra?

Which is better for coding, GLM-5.3 or GPT-5.6 Terra?

Which is better for agentic tasks, GLM-5.3 or GPT-5.6 Terra?

Which costs less, GLM-5.3 or GPT-5.6 Terra?

Which has the larger context window, GLM-5.3 or GPT-5.6 Terra?

Benchmark evidence

Agentic

Coding

Reasoning

Multimodal

Knowledge

Math

Related comparisons

Watch GLM-5.3 vs GPT-5.6 Terra