Enter opens the highlighted result. Esc closes.

GLM 5.3 Flash vs GPT-5.6 Terra

GPT-5.6 Terra leads GLM 5.3 Flash on coding, 63.9 to 57.7 on the Vibe Coding Index, and GLM 5.3 Flash costs 24.0x less per output token ($0.50 vs $12.00 per million). Updated October 22, 2026; 99 benchmarks have a result for both.

Replace GLM 5.3 Flash Replace GPT-5.6 Terra
GLM 5.3 FlashZ.ai
Coding
57.7
Overall
66.0
Output $/M
$0.50
56
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
42
vs boards won of 99 shared, 1 tied

GLM 5.3 Flash or GPT-5.6 Terra: which to pick

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 57.7 for GLM 5.3 Flash.

Pick GLM 5.3 Flash for output tokens 24.0x cheaper ($0.50 vs $12.00 per million) and a lower cost per solved task ($0.02 against $0.42).

Model AGLM 5.3 FlashZ.ai57.7/1006 independent benchmarks$0.02 per solved taskModel BGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved task
Shared results
99
GLM 5.3 Flash only
3
GPT-5.6 Terra only
28
Like-for-like categories
8 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.

At a glance

Coding index
GLM 5.3 Flash 57.7 from 6 benchmarks, GPT-5.6 Terra 63.9 from 6 benchmarks.
Widest category
Math, 25.3 points apart on average over 6 shared benchmarks.
Widest single gap
ALE-Bench: GLM 5.3 Flash 303.6 against GPT-5.6 Terra 1951.4, 54.9 points apart on a 0 to 100 scale.
Output price
GLM 5.3 Flash $0.50 against GPT-5.6 Terra $12.00 per million output tokens, 24.0x apart.
Context window
GLM 5.3 Flash takes 1.05M tokens, GPT-5.6 Terra 1.05M.

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
CategoryGLM 5.3 FlashBarsGPT-5.6 TerraTies
Coding814
Intelligence02
Agentic work551 tie
Reasoning510
Math24
Knowledge43
Web design90
General234
All shared boards56421 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index814
Coding benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
LiveBench coding80.6%86.2%GPT-5.6 Terra
LMArena WebDev16071522GLM 5.3 Flash
AA Coding Index71.576.7GPT-5.6 Terra
LiveCodeBench (Vals AI)80.5%85.9%GPT-5.6 Terra
SWE-bench Verified (Vals AI)92.0%95.4%GPT-5.6 Terra
Terminal-Bench 4 (Vals AI)37.4%22.7%GLM 5.3 Flash
Vibe Code Bench (Vals AI)30.8%74.6%GPT-5.6 Terra
Code migration (Vals AI)20.5%47.8%GPT-5.6 Terra
ProgramBench (Vals AI)0.0%0.5%GPT-5.6 Terra
IOI (Vals AI)52.5%87.6%GPT-5.6 Terra
Terminal-Bench 2.1 (Vals AI)62.9%77.5%GPT-5.6 Terra
Vibe Code Bench 1-100 (Vals AI)16.0%14.8%GLM 5.3 Flash
SkillsBench (Vals AI)40.2%58.9%GPT-5.6 Terra
CyberBench (Vals AI)67.9%72.1%GPT-5.6 Terra
SciCode51.6%55.0%GPT-5.6 Terra
Terminal-Bench Hard (Artificial Analysis run)Not measured62.9%Only GPT-5.6 Terra measured
FrontierCode31.8%41.3%GPT-5.6 Terra
FrontierSWE18.1%Not measuredOnly GLM 5.3 Flash measured
WeirdMLNot measured78.3%Only GPT-5.6 Terra measured
ALE-Bench303.61951.4GPT-5.6 Terra
LMArena Text: coding15071485GLM 5.3 Flash
LMArena Text: software and IT15001482GLM 5.3 Flash
LMArena WebDev: React16241513GLM 5.3 Flash
LMArena WebDev: HTML15771526GLM 5.3 Flash
LMArena WebDev: from an image15781541GLM 5.3 Flash
SciCodeNot measured10.8%Only GPT-5.6 Terra measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
AA Intelligence Index41.842.1GPT-5.6 Terra
Epoch Capabilities Index153.1160.1GPT-5.6 Terra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index55
Agentic work benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
AA Agentic Index50.943.2GLM 5.3 Flash
Design Arena: agents building web appsNot measured1120Only GPT-5.6 Terra measured
Design Arena: agents building full-stack appsNot measured1061Only GPT-5.6 Terra measured
Design Arena: agents building mobile appsNot measured1111Only GPT-5.6 Terra measured
Design Arena: agents building Android appsNot measured1062Only GPT-5.6 Terra measured
Design Arena: agents building gamesNot measured1083Only GPT-5.6 Terra measured
Design Arena: HTML slidesNot measured1058Only GPT-5.6 Terra measured
Design Arena: PowerPoint slidesNot measured1105Only GPT-5.6 Terra measured
LiveBench research70.1%60.4%GLM 5.3 Flash
LiveBench browser84.0%84.0%Tie
LiveBench long agentic28.4%48.4%GPT-5.6 Terra
SREBench (Vals AI)0.8%9.5%GPT-5.6 Terra
Finance Agent (Vals AI)57.9%54.4%GLM 5.3 Flash
Tax Agent Bench (Vals AI)31.6%30.0%GLM 5.3 Flash
Legal Research Bench (Vals AI)45.2%41.4%GLM 5.3 Flash
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly GLM 5.3 Flash measured
Excel Modeling Benchmark (Vals AI)55.9%66.2%GPT-5.6 Terra
Terminal-Bench-Science (Vals AI)2.9%10.0%GPT-5.6 Terra
τ²-Bench TelecomNot measured86.3%Only GPT-5.6 Terra measured
APEX-Agents52.8%58.2%GPT-5.6 Terra
BALROGNot measured53.2%Only GPT-5.6 Terra measured
Vending-Bench 2Not measured$7,343Only GPT-5.6 Terra measured
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index510
Reasoning benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
GPQA Diamond86.4%90.9%GPT-5.6 Terra
LiveBench reasoning77.6%90.6%GPT-5.6 Terra
MMMU Pro (Vals AI)86.0%86.5%GPT-5.6 Terra
GPQA Diamond (Artificial Analysis run)91.2%92.5%GPT-5.6 Terra
Humanity's Last Exam (Artificial Analysis run)39.9%42.9%GPT-5.6 Terra
GPQA Diamond (Epoch AI run)90.2%93.3%GPT-5.6 Terra
ARC-AGI91.0%96.5%GPT-5.6 Terra
ARC-AGI-265.8%83.9%GPT-5.6 Terra
SimpleBenchNot measured48.9%Only GPT-5.6 Terra measured
Chess puzzles21.0%47.0%GPT-5.6 Terra
Mystery game puzzles8.0%35.0%GPT-5.6 Terra
LMArena Text: hard prompts14901469GLM 5.3 Flash
LMArena Text: expert15111496GLM 5.3 Flash
LMArena Text: hard prompts in English14881465GLM 5.3 Flash
LMArena Vision: diagrams13171295GLM 5.3 Flash
LMArena Vision: homework13181312GLM 5.3 Flash
Kagi LLM BenchmarkNot measured51.3%Only GPT-5.6 Terra measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
OTIS Mock AIME93.9%99.7%GPT-5.6 Terra
FrontierMath, tiers 1 to 355.8%86.0%GPT-5.6 Terra
FrontierMath, tier 417.1%70.7%GPT-5.6 Terra
ProofBench21.0%74.0%GPT-5.6 Terra
LMArena Text: math15031465GLM 5.3 Flash
LMArena Text: mathematical work14971478GLM 5.3 Flash
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index43
Knowledge benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
MMLU Pro86.1%86.7%GPT-5.6 Terra
LegalBench (Vals AI)83.9%85.1%GPT-5.6 Terra
CorpFin (Vals AI)Not measured65.3%Only GPT-5.6 Terra measured
TaxEval (Vals AI)75.6%76.2%GPT-5.6 Terra
MortgageTax (Vals AI)Not measured67.3%Only GPT-5.6 Terra measured
MedCode (Vals AI)Not measured43.4%Only GPT-5.6 Terra measured
SimpleQA VerifiedNot measured43.2%Only GPT-5.6 Terra measured
LMArena Text: science14841452GLM 5.3 Flash
LMArena Text: medicine and healthcare14751430GLM 5.3 Flash
LMArena Text: legal and government14731461GLM 5.3 Flash
LMArena Text: business and finance14601448GLM 5.3 Flash
FACTS Benchmark SuiteNot measured52.0%Only GPT-5.6 Terra measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
Design Arena: websites12721268GLM 5.3 Flash
Design Arena: UI components13161256GLM 5.3 Flash
Design Arena: game dev12781229GLM 5.3 Flash
Design Arena: data viz12621240GLM 5.3 Flash
Design Arena: 3D13161134GLM 5.3 Flash
Design Arena: all code categories12821241GLM 5.3 Flash
Design Arena: SVG12851219GLM 5.3 Flash
Design Arena: ASCII art12671177GLM 5.3 Flash
LiveBench design77.2%76.0%GLM 5.3 Flash
GeneralLike-for-likePublic boards, shown as published, kept out of the index234
General benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
Vals Index50.9%Not measuredOnly GLM 5.3 Flash measured
LiveBench data analysis76.4%79.3%GPT-5.6 Terra
Public Benefits Bench (Vals AI)Not measured62.4%Only GPT-5.6 Terra measured
SAGE (Vals AI)Not measured47.0%Only GPT-5.6 Terra measured
MedScribe (Vals AI)88.9%82.9%GLM 5.3 Flash
Vals Multimodal IndexNot measured65.1%Only GPT-5.6 Terra measured
IFBenchNot measured71.2%Only GPT-5.6 Terra measured
Long context reasoning (AA-LCR)80.0%83.0%GPT-5.6 Terra
DTBenchNot measured93.3%Only GPT-5.6 Terra measured
LMCANot measured54.9%Only GPT-5.6 Terra measured
Surface Evolver Bench52.5%83.8%GPT-5.6 Terra
Furniture assemblyNot measured54.2%Only GPT-5.6 Terra measured
LMArena Text14711448GLM 5.3 Flash
LMArena Text: instruction following14781456GLM 5.3 Flash
LMArena Text: creative writing14411413GLM 5.3 Flash
LMArena Vision12941271GLM 5.3 Flash
LMArena Text: English14741449GLM 5.3 Flash
LMArena Text: non-English14621441GLM 5.3 Flash
LMArena Text: Chinese15311514GLM 5.3 Flash
LMArena Text: German14621460GLM 5.3 Flash
LMArena Text: Japanese14441454GPT-5.6 Terra
LMArena Text: Korean14361427GLM 5.3 Flash
LMArena Text: French14911466GLM 5.3 Flash
LMArena Text: Spanish14751451GLM 5.3 Flash
LMArena Text: Russian14651452GLM 5.3 Flash
LMArena Text: Polish14501446GLM 5.3 Flash
LMArena Text: multi-turn14691453GLM 5.3 Flash
LMArena Text: longer queries14811454GLM 5.3 Flash
LMArena Text: writing and language14551431GLM 5.3 Flash
LMArena Text: entertainment and media14401418GLM 5.3 Flash
LMArena Vision: English12951272GLM 5.3 Flash
LMArena Vision: Chinese13631337GLM 5.3 Flash
LMArena Vision: reading text12991278GLM 5.3 Flash
LMArena Vision: humor12791236GLM 5.3 Flash
LMArena Vision: creative writing12701248GLM 5.3 Flash
LMArena DocumentNot measured1472Only GPT-5.6 Terra measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GLM 5.3 Flash and GPT-5.6 Terra
BenchmarkGLM 5.3 FlashGPT-5.6 TerraLeader
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

GLM 5.3 Flash$0.0004Fits in one request
GPT-5.6 Terra$0.0080Fits in one request

GLM 5.3 Flash costs less

Repository review

50K input + 3K output tokens

GLM 5.3 Flash$0.0090Fits in one request
GPT-5.6 Terra$0.136Fits in one request

GLM 5.3 Flash costs less

Agent loop

200K input + 10K output tokens

GLM 5.3 Flash$0.035Fits in one request
GPT-5.6 Terra$0.520Fits in one request

GLM 5.3 Flash 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 GLM 5.3 Flash and GPT-5.6 Terra
SpecificationZ.ai GLM 5.3 FlashOpenAI GPT-5.6 Terra
MakerZ.aiOpenAI
WeightsOpen weightsNo public weights listed
ReleasedAugust 26, 2026July 9, 2026
Context window1.05M1.05M
Input $/Mtok$0.15$2.00
Output $/Mtok$0.50$12.00
Coding index57.763.9
Independent measurements behind it66
Cost per solved task$0.02$0.42
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.3 Flash better than GPT-5.6 Terra for coding?

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 57.7 for GLM 5.3 Flash. Pick GLM 5.3 Flash for output tokens 24.0x cheaper ($0.50 vs $12.00 per million) and a lower cost per solved task ($0.02 against $0.42).

Which is cheaper, GLM 5.3 Flash or GPT-5.6 Terra?

GLM 5.3 Flash costs $0.15 per million input tokens and $0.50 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Per solved SWE-bench Verified task, GLM 5.3 Flash costs $0.02 and GPT-5.6 Terra $0.42.

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

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

How many benchmarks is the GLM 5.3 Flash vs GPT-5.6 Terra comparison based on?

99 benchmarks have a result for both models as of October 22, 2026. GLM 5.3 Flash's coding index rests on 6 independent benchmarks and GPT-5.6 Terra's on 6. Where only one model has a result, the page says so instead of naming a winner.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/glm-5-3-flash-vs-gpt-5-6-terra" title="GLM 5.3 Flash vs GPT-5.6 Terra, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/glm-5-3-flash-vs-gpt-5-6-terra">LLMBenchmark.ai, GLM 5.3 Flash vs GPT-5.6 Terra</a></p>