Model profile
Z AI
New in 2026

Z.ai: GLM 5.1

Z.ai: GLM 5.1 is a budget-priced text-first model from Z AI with balanced runtime profile, large context posture, and the clearest fit around long-context research / agent workflows.

Best for: Long-context research / Agent workflowsBalanced latencyLarge contextBudget pricing
Intelligence
51.4

Benchmark blend

Coding
43.4

Dev workflow signal

Context
203K Tokens

Large

Input Price
$1.40

Budget tier

Decision snapshot
64

Z.ai: GLM 5.1 currently reads as a budget text-first option with large context and a balanced runtime profile.

Overall profile
Selective fit
Best for
Long-context research / Agent workflows
Latency tier
Balanced
Price tier
Budget
Source coverage
OpenRouterArtificial Analysis

Decision Strip

Decision rail before the raw tables

Core buy-side signals stay in one pass. The rest of the page expands only after intelligence, speed, context, and price are clear.

Intelligence
51.4
51

General reasoning and benchmark headroom.

Situational
Speed
73 tok/s
66

TTFT 1.08s

Competitive
Context
203K Tokens
88

How much prompt and task state can stay in view.

Above average
Price
$1.40
86

$4.40 output / 1M

Efficient

Editorial Profile

Z.ai: GLM 5.1 in one narrative

Positioning, tradeoffs, and fit are consolidated into one read instead of repeating the same story across separate cards.

Selective fitCoding score 43Math score N/A

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...

Identity

Z AI text-first profile

Positioning

Long-context research / Agent workflows with large context and balanced runtime.

Cost posture

Efficient spend profile. More comfortable for sustained prompt volume if the capability fit is right.

Strengths
  • Large context headroom supports repo-wide prompts and long research sessions.

Tradeoffs
  • Budget-friendly input pricing is a strength, but raw capability may vary by workload.

  • Latency is balanced rather than ultra-fast, which is fine for most workflows but not the snappiest tier.

  • Current metadata points to a text-first profile rather than a broad multimodal one.

Best fit
  • Long-context summarization, repo analysis, and policy or document review.

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Benchmarks

Grouped by job-to-be-done

Only benchmark categories with actual signal are shown. Secondary values stay as simple definitions instead of nested micro-cards.

General intelligence

Broad reasoning, knowledge depth, and flagship benchmark posture.

Intelligence Index
51.4
GPQA
86.8%
HLE
28.0%
Coding

Software implementation, debugging quality, and coding benchmark signal.

Coding Index
43.4
SciCode
43.8%
Agent / tool use

Long-horizon execution quality and interactive benchmark evidence.

IFBench
76.3%
TAU2
97.7%
TerminalBench Hard
43.2%
LCR
62.3%

Specs & Pricing

Technical snapshot and cost posture

Specs stay neutral, pricing gets emphasis through values rather than extra containers. Raw provider internals remain in metadata at the end.

Technical snapshot
Context Window
203K Tokens
Vision
Text-first
Modalities
text
Tokenizer
Other
Max Completion
131072
Moderation
No
Supported Parameters
frequency_penaltyinclude_reasoninglogit_biaslogprobsmax_tokensmin_ppresence_penaltyreasoningrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p
Input Modalities
text
Output Modalities
text
Price architecture
Input
per 1M input tokens
$1.40
Output
per 1M output tokens
$4.40
Blended
AA 3:1 mix
$2.15

This model is relatively efficient on price. It is the easier fit when sustained prompt volume matters.

OR Cache Read
$0.00

Metadata

Raw source tables at the end

Verification details remain available, but the page no longer forces them ahead of the editorial read.