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- Claude Opus 5.5 vs. Gemini 3.8 Flash
AnthropicGoogleLLM matchup
Claude Opus 5.5vs.Gemini 3.8 Flash
Which one is better?
Claude Opus 5.5 performs better than Gemini 3.8 Flash, but costs 5.3 times as much.
Claude Opus 5.5
Rank 1
Gemini 3.8 Flash
Rank 18
Claude Opus 5.5
Gemini 3.8 Flash
Claude Opus 5.5
Gemini 3.8 Flash
Claude Opus 5.5
Rank 8 of 785
Gemini 3.8 Flash
Rank 25 of 785
Choose Claude Opus 5.5 for
Choose Gemini 3.8 Flash for
No clear advantage
On this page
Where is the difference?
Strengths at a glance
Opus 5.5Gemini 3.8 FlashMedian of all ranked models
95 % range: Opus 5.5 121.2 to 138.7, Gemini 3.8 Flash 97.4 to 102.3.
The same values and verdicts as the bars below. In the close-up the net starts at 90 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, Gemini 3.8 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. Gemini 3.8 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 | Gemini 3.8 Flash | Gap | Verdict | Test series |
|---|---|---|---|---|---|
| low | 106.6 | 99.7 | 3.8 | Opus 5.5 slightly ahead | 3 |
| medium | 117.5 | 105.6 | 15.7 | Opus 5.5 ahead | 12 |
| high | 120.4 | 106.5 | 17.7 | Opus 5.5 ahead | 12 |
| Overall index (max vs. high) | 126.1 | 106.5 | 19.6 | 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.
Gemini 3.8 Flash
The response reached the token limit. No complete recording is available.
Oct 5, 2026 · 40 s · $0.03
Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.
Test details
- Run date
- Oct 5, 2026
- API provider
- openrouter
- Requested API model
- google/gemini-3.8-flash
- Reasoning setting
- high
- Token limit including reasoning
- 8,192 tokens
- Output tokens
- 8,188 tokens
- Cost of the attempt
- $0.0307
- Response time
- 40.2 s
- API model reported in response
- google/gemini-3.8-flash
- Pinned endpoint
- Google AI Studio | google/gemini-3.8-flash-20260902
- Temperature
- Provider default
- Test protocol
- community-visual-tests-v1
- Technical checks
- Failed
Earlier attempts (3)
- Oct 2, 2026API request failedReasoning setting: high
- Oct 1, 2026API request failedReasoning setting: high
- 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
Gemini 3.8 Flash
Unavailable in this round
Claude Opus 5.5 and Gemini 3.8 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 Gemini 3.8 Flash: 68 to 61 out of 100.
Over time
Weekly values from October 18, 2026 to November 7, 2026
Claude Opus 5.5Gemini 3.8 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 | Gemini 3.8 Flash |
|---|---|---|
| Intelligence | ||
| Overall indexpoints, 100 = reference group average, higher is better | 126.1 | 106.5 |
| Rank | Rank 1 of 92 | Rank 18 of 92 |
| Price per 1M tokens | ||
| Inputwhat you send | $4 | $0.75 |
| Outputwhat the model writes | $20 | $3.75 |
| Cost per task (own tests)average of 2 original-protocol tasks both models passed (SVG short test not included) | $0.12 | $0.044 |
| Speed | ||
| Tokens per second | 106 | 115 |
| Popularity | ||
| Popularitysearch, usage and mentions, 0 to 100 | 68Rank 8 of 785 | 61Rank 25 of 785 |
| Technical | ||
| Context windowhow much text the model reads at once | 1 M tokens≈ 1,500 A4 pages | 1.05 M tokens≈ 1,570 A4 pages |
| Knowledge cutoff | June 2026 | March 2026 |
| Released | Sep 22, 2026 | Sep 2, 2026 |
| Availability | Active | Active |
| Open weights | no | no |
Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis
Is there a better choice?
Overall index 106.6, rank 17$0.15 input and $0.60 output per 1M tokens
Opus 5.5 vs. DeepSeek V4.1 Flash 1017Shared 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: Gemini 3.8 Flash
Show 54 more benchmarks
More comparisons
Compare Claude Opus 5.5 and Gemini 3.8 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 4.6 vs. Gemini 3.8 Flash
- 3Claude Opus 5.5 vs. Claude Sonnet 5.5
- 4Claude Sonnet 5.5 vs. Gemini 3.8 Flash
- 5Claude Opus 5.5 vs. DeepSeek-V4-Pro
- 6Claude Opus 5.5 vs. Kimi K3.1 Pro
- 7Claude Opus 5.5 vs. Gemini 4 Argon
- 8GPT-6 Luna vs. Gemini 3.8 Flash
- 9Gemini 3.8 Flash vs. DeepSeek-V4.1-Flash
Show all 80 comparisons
- 10Claude Opus 5.5 vs. Claude Fable 5.1
- 11Claude Opus 5.5 vs. DeepSeek-V4.1-Flash
- 12Claude Opus 5.5 vs. Qwen 3.8 Max 0902
- 13Claude Opus 5.5 vs. GLM-5.3-Flash
- 14Claude Opus 5.5 vs. GPT-6.1 Sol
- 15Claude Opus 5.5 vs. Kimi K3
- 16Claude Opus 5.5 vs. Claude Sonnet 5
- 17Claude Opus 5.5 vs. Claude Haiku 5.5
- 18Gemini 3.8 Flash vs. Gemini 3.1 Pro Preview
- 19Claude Sonnet 4.6 vs. Gemini 3.8 Flash
- 20Claude Opus 5.5 vs. GLM-5.3
- 21Gemini 3.8 Flash vs. Gemini 3.5 Flash-Lite
- 22GPT-6 Sol vs. Gemini 3.8 Flash
- 23Claude Opus 5.5 vs. GPT-5.6 Terra
- 24Claude Opus 5.5 vs. Gemini 3.1 Pro Preview
- 25Claude Opus 5.5 vs. Claude Opus 4.6
- 26GPT-5.6 Sol vs. Gemini 3.8 Flash
- 27Gemini 3.8 Flash vs. Grok 4.7
- 28Claude Haiku 5.5 vs. Gemini 3.8 Flash
- 29Claude Opus 5.5 vs. Claude Sonnet 4.6
- 30Gemini 3.8 Flash vs. GLM-5.3-Flash
- 31Claude Opus 5.5 vs. Qwen 3.8 27B
- 32GPT-6.1 Sol vs. Gemini 3.8 Flash
- 33Claude Opus 5.5 vs. Grok 4.6
- 34Claude Opus 5.5 vs. GLM-5.2
- 35Claude Opus 5.5 vs. Gemini 4 Carbon
- 36Claude Opus 5.5 vs. DeepSeek V4.1 Flash 1017
- 37Claude Opus 5.5 vs. Claude Sonnet 4.5
- 38Claude Opus 5.5 vs. Muse Spark 1.3
- 39Gemini 3.8 Flash vs. DeepSeek-V4-Pro
- 40Claude Opus 5.5 vs. Claude Opus 4.8
- 41Claude Opus 5.5 vs. GPT-5.6 Luna
- 42Gemini 3.8 Flash vs. DeepSeek V4.1 Flash 1017
- 43Claude Opus 5 vs. Gemini 3.8 Flash
- 44GPT-5.6 Luna vs. Gemini 3.8 Flash
- 45Claude Opus 5.5 vs. Mistral Large 4
- 46Claude Opus 5.5 vs. GPT-5.6 Sol
- 47Gemini 3.8 Flash vs. DeepSeek-V4-Flash
- 48Claude Sonnet 4.5 vs. Gemini 3.8 Flash
- 49Claude Opus 5.5 vs. GPT-5.5
- 50Gemini 3.8 Flash vs. Qwen 3.8 27B
- 51Claude Opus 5.5 vs. DeepSeek-V4-Flash
- 52Claude Opus 5.5 vs. Grok 4.7
- 53Claude Opus 5.5 vs. Mistral Large 3
- 54Claude Opus 5.5 vs. GPT-6 Luna
- 55Gemini 3.8 Flash vs. Muse Spark 1.3
- 56Claude Opus 5.5 vs. Claude Opus 4.5
- 57GPT-6 Astra vs. Gemini 3.8 Flash
- 58Gemini 3.8 Flash vs. Gemini 3.6 Flash
- 59Gemini 3.8 Flash vs. Grok 4.6
- 60GPT-5.4 mini vs. Gemini 3.8 Flash
- 61Claude Opus 5.5 vs. Claude Fable 5
- 62Gemini 3.8 Flash vs. GLM-5.3
- 63Claude Opus 5.5 vs. GPT-6 Sol
- 64Claude Opus 5.5 vs. Gemini 3.6 Flash
- 65Claude Opus 5.5 vs. Mistral Medium 3.5
- 66Claude Opus 5.5 vs. Muse Wonder Full
- 67Claude Opus 5.5 vs. Claude Haiku 4.5
- 68Gemini 3.8 Flash vs. GLM-5.2
- 69Gemini 3.8 Flash vs. Mistral Large 4
- 70Claude Opus 5.5 vs. Gemini 3.5 Flash
- 71Claude Opus 5.5 vs. GPT-6.1 Terra
- 72Claude Opus 5.5 vs. GPT-5.4
- 73Claude Opus 5.5 vs. GLM-5.1
- 74Claude Fable 5 vs. Gemini 3.8 Flash
- 75GPT-6.1 Terra vs. Gemini 3.8 Flash
- 76Claude Haiku 4.5 vs. Gemini 3.8 Flash
- 77GPT-5.5 vs. Gemini 3.8 Flash
- 78Gemini 3.8 Flash vs. Gemini 3.5 Flash
- 79Gemini 3.8 Flash vs. MiMo-V2.5-Pro
- 80Gemini 3.8 Flash vs. Kimi K3.1 Pro