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GLM 5.3 FlashX vs GPT-6 Astra Pro

GLM 5.3 FlashX costs 40.0x less per output token than GPT-6 Astra Pro ($1.25 vs $50.00 per million). Updated October 22, 2026; no benchmark has tested both models yet.

Replace GLM 5.3 FlashX Replace GPT-6 Astra Pro
GLM 5.3 FlashXZ.ai
Coding
No data
Overall
No data
Output $/M
$1.25
GPT-6 Astra ProOpenAI
Coding
No data
Overall
No data
Output $/M
$50.00
vs $1.25 vs $50.00 per 1M output tokens. GLM 5.3 FlashX is 40.0x cheaper.

GLM 5.3 FlashX or GPT-6 Astra Pro: which to pick

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

Pick GLM 5.3 FlashX for output tokens 40.0x cheaper ($1.25 vs $50.00 per million).

Model AGLM 5.3 FlashXZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGPT-6 Astra ProOpenAINot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested both yet. GLM 5.3 FlashX has none yet; GPT-6 Astra Pro on WeirdML and Chess puzzles. Compare them on price and context instead.

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 FlashX not benchmarked, GPT-6 Astra 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 FlashX $1.25 against GPT-6 Astra Pro $50.00 per million output tokens, 40.0x apart.
Context window
GLM 5.3 FlashX takes 1.05M tokens, GPT-6 Astra 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.

CodingDirectional onlySix of these boards feed the Vibe Coding Index1 board measured
Coding benchmarks for GLM 5.3 FlashX and GPT-6 Astra Pro
BenchmarkGLM 5.3 FlashXGPT-6 Astra ProLeader
WeirdMLNot measured93.6%Only GPT-6 Astra Pro measured
Neither model has a result on the other 38 boards here
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
Reasoning benchmarks for GLM 5.3 FlashX and GPT-6 Astra Pro
BenchmarkGLM 5.3 FlashXGPT-6 Astra ProLeader
Chess puzzlesNot measured76.0%Only GPT-6 Astra Pro measured
Neither model has a result on the other 21 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 FlashX$0.0010Fits in one request
GPT-6 Astra Pro$0.035Fits in one request

GLM 5.3 FlashX costs less

Repository review

50K input + 3K output tokens

GLM 5.3 FlashX$0.022Fits in one request
GPT-6 Astra Pro$0.650Fits in one request

GLM 5.3 FlashX costs less

Agent loop

200K input + 10K output tokens

GLM 5.3 FlashX$0.086Fits in one request
GPT-6 Astra Pro$2.50Fits in one request

GLM 5.3 FlashX 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 FlashX and GPT-6 Astra Pro
SpecificationZ.ai GLM 5.3 FlashXOpenAI GPT-6 Astra Pro
MakerZ.aiOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 18, 2026September 4, 2026
Context window1.05M1.05M
Input $/Mtok$0.37$10.00
Output $/Mtok$1.25$50.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.3 FlashX better than GPT-6 Astra Pro for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 5.3 FlashX for output tokens 40.0x cheaper ($1.25 vs $50.00 per million).

Which is cheaper, GLM 5.3 FlashX or GPT-6 Astra Pro?

GLM 5.3 FlashX costs $0.37 per million input tokens and $1.25 per million output tokens; GPT-6 Astra Pro costs $10.00 and $50.00. Cost per solved task is known for neither of them.

Which has the bigger context window, GLM 5.3 FlashX or GPT-6 Astra Pro?

GPT-6 Astra Pro, with 1.05M tokens against 1.05M.

Has any benchmark tested both GLM 5.3 FlashX and GPT-6 Astra Pro?

No benchmark has tested both yet. GLM 5.3 FlashX has none yet; GPT-6 Astra Pro on WeirdML and Chess puzzles. Compare them on price and context instead. Data as of October 22, 2026.

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