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- Claude Opus 5.5 vs. GLM-5.3-Flash
AnthropicZ.aiLLM matchup
Claude Opus 5.5vs.GLM-5.3-Flash
Which one is better?
Claude Opus 5.5 performs better than GLM-5.3-Flash, but costs 26.7 times (input) and 40 times (output) as much.
Claude Opus 5.5
Rank 1
GLM-5.3-Flash
Rank 37
Claude Opus 5.5
GLM-5.3-Flash
Claude Opus 5.5
GLM-5.3-Flash
Claude Opus 5.5
Rank 8 of 785
GLM-5.3-Flash
Rank 202 of 785
Choose Claude Opus 5.5 for
Choose GLM-5.3-Flash for
No clear advantage
On this page
Where is the difference?
Strengths at a glance
Opus 5.5GLM-5.3-FlashMedian of all ranked models
95 % range: Opus 5.5 121.2 to 138.7, GLM-5.3-Flash 91.3 to 102.2.
The same values and verdicts as the bars below. In the close-up the net starts at 80 points, just below the weaker model's lowest value; the reference group average is 100.
Opus 5.5 is ahead in 10 of 10 areas, GLM-5.3-Flash in none.
Opus 5.5 ahead: 10
Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.
Show 4 more areas that do not count toward the overall index
Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.
Claude Opus 5.5 vs. GLM-5.3-Flash at the same effort
Both models measured at the same reasoning efforts. This shows whether a lead comes from the model or only from more compute.
| Effort | Opus 5.5 | GLM-5.3-Flash | Gap | Verdict | Test series |
|---|---|---|---|---|---|
| max | 126.1 | 94.2 | 26.9 | Opus 5.5 ahead | 13 |
| Overall index (max vs. max) | 126.1 | 94.2 | 32.0 | Opus 5.5 ahead |
Gap and verdict compare only the Artificial Analysis test series in which both models are measured at that effort. Tied below 3 points, ahead only beyond two standard errors. The single values rest on all test series of each model, so their difference can deviate from the gap.
Which model for which task?
Everyday tasks, translated from the area values above. Each row names the values it rests on.
See for yourself: same task, one attempt
The same prompt for both models. We show the latest attempt without fixes; it does not count toward the overall index.
Claude Opus 5.5

Oct 1, 2026 · 33 s · $0.07
Test details
- Run date
- Oct 1, 2026
- API provider
- openrouter
- Requested API model
- anthropic/claude-opus-5.5
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 3,536 tokens
- Cost of the attempt
- $0.0708
- Response time
- 33.2 s
- API model reported in response
- anthropic/claude-opus-5.5
- Pinned endpoint
- Anthropic | anthropic/claude-opus-5.5-20260921
- Temperature
- Provider default
- Test protocol
- community-visual-tests-v1
- Technical checks
- Passed, not a quality rating
Visually reviewed. This individual test does not establish overall model quality.
GLM-5.3-Flash

Oct 1, 2026 · 50 s · $0.0013
Test details
- Run date
- Oct 1, 2026
- API provider
- openrouter
- Requested API model
- z-ai/glm-5.3-flash
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 2,563 tokens
- Cost of the attempt
- $0.0013
- Response time
- 49.7 s
- API model reported in response
- z-ai/glm-5.3-flash
- Pinned endpoint
- Z.AI | z-ai/glm-5.3-flash-20260826
- Temperature
- Provider default
- Test protocol
- community-visual-tests-v1
- Technical checks
- Passed, not a quality rating
Visually reviewed. This individual test does not establish overall model quality.
Earlier attempts (1)
- Sep 7, 2026API request failedReasoning setting: high
SVG short test
SVG short test
One SVG task with the same fixed settings for every model, without hidden thinking.
Prompt
Return only one standalone SVG of a pelican riding a bicycle. Use viewBox="0 0 800 600", simple shapes, two clearly visible wheels and a recognizable pelican with a long beak. At most 30 SVG elements and 1800 characters. No Markdown, explanations, comments, scripts, animation, CSS or external resources.
Claude Opus 5.5
Unavailable in this round
GLM-5.3-Flash
Unavailable in this round
Claude Opus 5.5 and GLM-5.3-Flash in the overall index
Every model with a place in the overall index, both models of this matchup highlighted. You can add or hide other models.
Overall index (Gradually Meta-Score v4)
20 of 92 models
4 models in this view are measured at a lower reasoning effort than max in the overall index. Dashed column: lower reasoning effort than the top.
Popularity compared
How often the models are searched for, used and mentioned, on a scale from 0 to 100.
Claude Opus 5.5 is more popular than GLM-5.3-Flash: 68 to 44 out of 100.
Over time
Weekly values from October 18, 2026 to November 7, 2026
Claude Opus 5.5GLM-5.3-Flash
All data side by side
The better value is bold. For the overall index only when the gap is clear.
| Metric | Claude Opus 5.5 | GLM-5.3-Flash |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 126.1 | 94.2 |
| Rank | Rank 1 of 92 | Rank 37 of 92 |
| Price per 1M tokens | ||
| Inputwhat you send | $4 | $0.15 |
| Outputwhat the model writes | $20 | $0.50 |
| Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included) | $0.11 | $0.005 |
| Speed | ||
| Tokens per second | 106 | 56 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 68Rank 8 of 785 | 44Rank 202 of 785 |
| Technical | ||
| Context windowhow much text the model reads at once | 1 M tokens≈ 1,500 A4 pages | 1 M tokens≈ 1,500 A4 pages |
| Knowledge cutoff | June 2026 | n/a |
| Released | Sep 22, 2026 | Aug 26, 2026 |
| Availability | Active | Open Source |
| Open weights | no | yes |
Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis
Is there a better choice?
Overall index 103.4, rank 20$0.10 input and $0.50 output per 1M tokens
Opus 5.5 vs. Claude Haiku 5.5Shared benchmarks
Single results from the same benchmark version, task and metric. A value is bold only with the same test setup and a clear gap.
A: Claude Opus 5.5B: GLM-5.3-Flash
Show 54 more benchmarks
More comparisons
Compare Claude Opus 5.5 and GLM-5.3-Flash with the models people compare them with most often.
Compare another matchup
Predecessor and successor
The most popular comparisons
- 1Claude Opus 5.5 vs. GPT-6 Astra
- 2Claude Opus 5.5 vs. Claude Sonnet 5.5
- 3Claude Opus 5.5 vs. DeepSeek-V4-Pro
- 4Claude Opus 5.5 vs. Kimi K3.1 Pro
- 5Claude Opus 5.5 vs. Gemini 4 Argon
- 6Claude Opus 5.5 vs. Gemini 3.8 Flash
- 7Claude Opus 5.5 vs. Claude Fable 5.1
- 8Claude Opus 5.5 vs. DeepSeek-V4.1-Flash
- 9Claude Opus 5.5 vs. Qwen 3.8 Max 0902
Show all 78 comparisons
- 10Claude Opus 5.5 vs. GPT-6.1 Sol
- 11Claude Opus 5.5 vs. Kimi K3
- 12Claude Opus 5.5 vs. Claude Sonnet 5
- 13Claude Opus 5.5 vs. Claude Haiku 5.5
- 14Claude Opus 5.5 vs. GLM-5.3
- 15GPT-6 Luna vs. GLM-5.3-Flash
- 16Claude Opus 5.5 vs. GPT-5.6 Terra
- 17Claude Opus 5.5 vs. Gemini 3.1 Pro Preview
- 18Claude Opus 5.5 vs. Claude Opus 4.6
- 19Claude Opus 5.5 vs. Claude Sonnet 4.6
- 20Gemini 3.8 Flash vs. GLM-5.3-Flash
- 21DeepSeek V4.1 Flash 1017 vs. GLM-5.3-Flash
- 22Claude Opus 5.5 vs. Qwen 3.8 27B
- 23Grok 4.7 vs. GLM-5.3-Flash
- 24Claude Opus 5.5 vs. Grok 4.6
- 25Claude Opus 5.5 vs. GLM-5.2
- 26GPT-6.1 Sol vs. GLM-5.3-Flash
- 27Claude Opus 5.5 vs. Gemini 4 Carbon
- 28Claude Opus 5.5 vs. DeepSeek V4.1 Flash 1017
- 29Claude Opus 5.5 vs. Claude Sonnet 4.5
- 30Claude Opus 5.5 vs. Muse Spark 1.3
- 31Claude Opus 5.5 vs. Claude Opus 4.8
- 32DeepSeek-V4.1-Flash vs. GLM-5.3-Flash
- 33Claude Opus 5.5 vs. GPT-5.6 Luna
- 34GPT-5.4 vs. GLM-5.3-Flash
- 35Claude Sonnet 4.6 vs. GLM-5.3-Flash
- 36Claude Opus 5 vs. GLM-5.3-Flash
- 37GPT-6 Sol vs. GLM-5.3-Flash
- 38DeepSeek-V4-Flash vs. GLM-5.3-Flash
- 39Claude Opus 5.5 vs. Mistral Large 4
- 40Claude Opus 5.5 vs. GPT-5.6 Sol
- 41GLM-5.3-Flash vs. Mistral Large 4
- 42GLM-5.3-Flash vs. GLM-5.3
- 43Claude Opus 5.5 vs. GPT-5.5
- 44GPT-6 Astra vs. GLM-5.3-Flash
- 45Claude Haiku 5.5 vs. GLM-5.3-Flash
- 46GPT-5.6 Sol vs. GLM-5.3-Flash
- 47Claude Opus 5.5 vs. DeepSeek-V4-Flash
- 48Claude Opus 5.5 vs. Grok 4.7
- 49Claude Opus 4.6 vs. GLM-5.3-Flash
- 50Claude Opus 5.5 vs. Mistral Large 3
- 51Claude Opus 5.5 vs. GPT-6 Luna
- 52Claude Opus 5.5 vs. Claude Opus 4.5
- 53Claude Opus 4.8 vs. GLM-5.3-Flash
- 54Kimi K3 vs. GLM-5.3-Flash
- 55Claude Opus 5.5 vs. Claude Fable 5
- 56Claude Opus 5.5 vs. GPT-6 Sol
- 57Claude Haiku 4.5 vs. GLM-5.3-Flash
- 58Claude Opus 5.5 vs. Gemini 3.6 Flash
- 59Claude Opus 5.5 vs. Mistral Medium 3.5
- 60Claude Opus 5.5 vs. Muse Wonder Full
- 61Claude Sonnet 5.5 vs. GLM-5.3-Flash
- 62Claude Opus 5.5 vs. Claude Haiku 4.5
- 63GLM-5.3-Flash vs. Qwen 3.8 27B
- 64Claude Fable 5.1 vs. GLM-5.3-Flash
- 65DeepSeek-V4-Pro vs. GLM-5.3-Flash
- 66Claude Opus 5.5 vs. Gemini 3.5 Flash
- 67Claude Opus 5.5 vs. GPT-6.1 Terra
- 68Claude Opus 5.5 vs. GPT-5.4
- 69Claude Opus 5.5 vs. GLM-5.1
- 70GLM-5.3-Flash vs. Qwen 3.8 Max 0902
- 71GLM-5.3-Flash vs. MiMo-V2.5-Pro
- 72GLM-5.3-Flash vs. GLM-5.2
- 73GPT-5.6 Luna vs. GLM-5.3-Flash
- 74GPT-5.5 vs. GLM-5.3-Flash
- 75Grok 4.3 vs. GLM-5.3-Flash
- 76Kimi K3.1 Pro vs. GLM-5.3-Flash
- 77GPT-6.1 Terra vs. GLM-5.3-Flash
- 78Gemini 4 Argon vs. GLM-5.3-Flash