MODEL PROOF
GLM 5.1
BETTER VALUE OPTION
A stored alternative has an equal-or-higher measured score and an equal-or-lower price.
Price under confirmation since 2026-10-21. Upstream lists another price for this model now, or other prices from its sellers. What is shown is the last we published; the new figures are published once a second day shows the same values. · Serving precision differs between offers.
MiMo-V2.6-Pro · Δ score 27.7 points · 70% lower measured price · $0.540 / 1M tokens (Price under confirmation since Oct 21, 2026)
Gemini 3.6 Flash is a further stored option with these losses: 131K → 66K max output
- Independent LMArena score
- 1,462.6 ± 3.59 · 62,175 votes
- Context window
- 204.8K
- Maximum output
- 131.07K
- Input modalities
- text
- Output modalities
- text
- Published input price
- $1.19 / 1M tokens
- Published output price
- $3.74 / 1M tokens
- Pricing kind
- fixed
Inspect complete billing conditions and endpoint terms below.
Price from SiliconFlow: the cheapest offer that is serving, at standard delivery, with at least 90% of the reference context and at the maker’s precision or better, at its standard rate.
Price under confirmation since 2026-10-21 Upstream lists another price for this model now, or other prices from its sellers. What is shown is the last we published; the new figures are published once a second day shows the same values.
Cheaper right now: $1.48/M at Baidu — promotion 31% It does not pass the like-for-like test, so it never sets a rank.
Every price dimension · USD per million tokens
| Input | $1.19/M |
|---|---|
| Output | $3.74/M |
| Cached input | $0.600/M |
| Cache write | Unknown/M |
| Cache write 1h | Unknown/M |
| Reasoning | Unknown/M |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
Headline cheapest is a lower precision. Like-for-like at the best declared precision is $1.19/M from SiliconFlow.
13 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| Baidubaidu/fp8 Endpoint terms
| $0.965 | $3.03 | fp8 | 100.00% |
| StreamLakestreamlake/fp8 Endpoint terms
| $0.966 | $3.04 | fp8 | 99.91% |
| Chuteschutes/fp8 Endpoint terms
| $0.980 | $3.08 | fp8 | 75.35% |
| SiliconFlowsiliconflow/fp8 Endpoint terms
| $1.19 | $3.74 | fp8 | 100.00% |
| Phalaphala Endpoint terms
| $1.21 | $4.20 | undeclared | 59.26% |
| AtlasCloudatlas-cloud/fp8 Endpoint terms
| $1.26 | $3.96 | fp8 | 100.00% |
| Alibabaalibaba/fp8 Endpoint terms
| $1.33 | $4.18 | fp8 | 100.00% |
| Novitanovita/fp8 Endpoint terms
| $1.38 | $4.40 | fp8 | 100.00% |
| Nebiusnebius/fp8 Endpoint terms
| $1.40 | $4.40 | fp8 | 96.64% |
| GMICloudgmicloud/fp8 Endpoint terms
| $1.40 | $4.40 | fp8 | 100.00% |
| Z.AIz-ai/fp8 Endpoint terms
| $1.40 | $4.40 | fp8 | 100.00% |
| Friendlifriendli Endpoint terms
| $1.40 | $4.40 | undeclared | 100.00% |
| Venicevenice/fp8 Endpoint terms
| $1.40 | $4.40 | fp8 | 97.72% |
Independent scores
| LMArena Elo | 1462.6default |
|---|---|
| LMArena row | glm-5.1 |
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- Agenticslides #2 1245
- Data visualisation #3 1366
- Spreadsheet #3 1315
- Agenticslides(python pptx) #3 1240
- Pptxslides #3 1241
- Agentichtmlslides #5 1205
- Agenticslides(html) #5 1204
- Python pptxslides #6 1258
Per-task Elo and rank from Design Arena, via OpenRouter’s model feed. The rank is the feed’s, and it counts models OpenRouter does not list.
Capability
| Context window | 204K |
|---|---|
| Max output | 131K |
| Input modes | text |
| Tool use | yes |
| Reasoning | optional |
| Open weights | Unknown |
Provenance
| Price source | Published record of 2026-10-18, under confirmation since 2026-10-21 |
|---|---|
| Fetched | 2026-10-21 |
| Held | Price and provider offers kept at the published record of 2026-10-18 until a second day confirms the newer upstream value, or after 3 days until one day’s two readings agree. |
| Quality data | verified |
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...
Questions this page answers
What does GLM 5.1 cost?
$1.19/M in, $3.74/M out: the published record of 2026-10-18, under confirmation since 2026-10-21. That is the API row, not a subscription.
Does GLM 5.1 have an independent quality score?
GLM 5.1 has an LMArena score in this catalogue.
What beats GLM 5.1?
MiMo-V2.6-Pro has an equal-or-higher measured score and an equal-or-lower price.
Does this page use Artificial Analysis scores for GLM 5.1?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
Is the cheapest GLM 5.1 endpoint the same product?
Headline cheapest is a lower precision. Like-for-like at the best declared precision is $1.19/M from SiliconFlow.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/z-ai__glm-5.1/)<a href="https://undominated.ai/models/z-ai__glm-5.1/"><img src="https://undominated.ai/badge/z-ai__glm-5.1.svg" alt="GLM 5.1 — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/z-ai__glm-5.1.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
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