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GLM 5.3 Prime vs GPT-5.6 Terra Pro

GLM 5.3 Prime costs 1.4x less per output token than GPT-5.6 Terra Pro ($8.80 vs $12.00 per million). Updated October 22, 2026; no benchmark has tested both models yet.

Replace GLM 5.3 Prime Replace GPT-5.6 Terra Pro
GLM 5.3 PrimeZ.ai
Coding
No data
Overall
No data
Output $/M
$8.80
GPT-5.6 Terra ProOpenAI
Coding
No data
Overall
No data
Output $/M
$12.00
vs $8.80 vs $12.00 per 1M output tokens. GLM 5.3 Prime is 1.4x cheaper.

GLM 5.3 Prime or GPT-5.6 Terra Pro: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick GLM 5.3 Prime for output tokens 1.4x cheaper ($8.80 vs $12.00 per million).

Model AGLM 5.3 PrimeZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-5.6 Terra ProOpenAINot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested either model yet, so price and context are the only way to compare them.

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 Prime not benchmarked, GPT-5.6 Terra Pro not benchmarked.
Widest category
None yet: no category has been tested on both models.
Widest single gap
None yet: no benchmark has tested both models.
Output price
GLM 5.3 Prime $8.80 against GPT-5.6 Terra Pro $12.00 per million output tokens, 1.4x apart.
Context window
GLM 5.3 Prime takes 1M tokens, GPT-5.6 Terra Pro 1.05M.

Benchmark by benchmark

Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.

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 Prime$0.0072Fits in one request
GPT-5.6 Terra Pro$0.0080Fits in one request

GLM 5.3 Prime costs less

Repository review

50K input + 3K output tokens

GLM 5.3 Prime$0.166Fits in one request
GPT-5.6 Terra Pro$0.136Fits in one request

GPT-5.6 Terra Pro costs less

Agent loop

200K input + 10K output tokens

GLM 5.3 Prime$0.648Fits in one request
GPT-5.6 Terra Pro$0.520Fits in one request

GPT-5.6 Terra Pro 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 Prime and GPT-5.6 Terra Pro
SpecificationZ.ai GLM 5.3 PrimeOpenAI GPT-5.6 Terra Pro
MakerZ.aiOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 23, 2026July 9, 2026
Context window1M1.05M
Input $/Mtok$2.80$2.00
Output $/Mtok$8.80$12.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

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

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 5.3 Prime for output tokens 1.4x cheaper ($8.80 vs $12.00 per million).

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

GLM 5.3 Prime costs $2.80 per million input tokens and $8.80 per million output tokens; GPT-5.6 Terra Pro costs $2.00 and $12.00. Cost per solved task is known for neither of them.

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

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

Has any benchmark tested both GLM 5.3 Prime and GPT-5.6 Terra Pro?

No benchmark has tested either model yet, so price and context are the only way to compare them. Data as of October 22, 2026.

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