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GLM 5.3 FlashX vs Grok 4.20 Multi-Agent

GLM 5.3 FlashX costs 2.0x less per output token than Grok 4.20 Multi-Agent ($1.25 vs $2.50 per million). Updated October 21, 2026; no benchmark has tested both models yet.

Replace GLM 5.3 FlashX Replace Grok 4.20 Multi-Agent
GLM 5.3 FlashXZ.ai
Coding
No data
Overall
No data
Output $/M
$1.25
Grok 4.20 Multi-AgentxAI
Coding
No data
Overall
No data
Output $/M
$2.50
vs $1.25 vs $2.50 per 1M output tokens. GLM 5.3 FlashX is 2.0x cheaper.

GLM 5.3 FlashX or Grok 4.20 Multi-Agent: 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 2.0x cheaper ($1.25 vs $2.50 per million).

Model AGLM 5.3 FlashXZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BGrok 4.20 Multi-AgentxAINot 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 FlashX not benchmarked, Grok 4.20 Multi-Agent 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 Grok 4.20 Multi-Agent $2.50 per million output tokens, 2.0x apart.
Context window
GLM 5.3 FlashX takes 1.05M tokens, Grok 4.20 Multi-Agent 2M.

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 FlashX$0.0010Fits in one request
Grok 4.20 Multi-Agent$0.0025Fits 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
Grok 4.20 Multi-Agent$0.070Fits 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
Grok 4.20 Multi-Agent$0.275Fits 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 Grok 4.20 Multi-Agent
SpecificationZ.ai GLM 5.3 FlashXSpaceXAI Grok 4.20 Multi-Agent
MakerZ.aixAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 18, 2026March 31, 2026
Context window1.05M2M
Input $/Mtok$0.37$1.25
Output $/Mtok$1.25$2.50
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 Grok 4.20 Multi-Agent 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 2.0x cheaper ($1.25 vs $2.50 per million).

Which is cheaper, GLM 5.3 FlashX or Grok 4.20 Multi-Agent?

GLM 5.3 FlashX costs $0.37 per million input tokens and $1.25 per million output tokens; Grok 4.20 Multi-Agent costs $1.25 and $2.50. Cost per solved task is known for neither of them.

Which has the bigger context window, GLM 5.3 FlashX or Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent, with 2M tokens against 1.05M.

Has any benchmark tested both GLM 5.3 FlashX and Grok 4.20 Multi-Agent?

No benchmark has tested either model yet, so price and context are the only way to compare them. Data as of October 21, 2026.

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