text model comparison
Claude Opus 5.5 vs Gemini 3.1 Pro Preview
Claude Opus 5.5 and Gemini 3.1 Pro Preview are both current text models, from Anthropic and Google. On Arena Text, Claude Opus 5.5 scores 1509 Elo and Gemini 3.1 Pro Preview 1487 Elo (Arena, measured October 28, 2026). Both accept about 1.05M tokens of context (1,048,576 and 1,000,000).
- Higher Arena Text
- Claude Opus 5.51509 Elo against 1487 Elo
- Longer context window
- Gemini 3.1 Pro Preview1.05M tokens against 1M tokens
- Newer release
- Claude Opus 5.5Sep 2026 against Feb 2026
Data verified November 3, 2026 · Dataset 2026-11-03
Side by side
Claude Opus 5.5 and Gemini 3.1 Pro Preview, line by line
Prices in effect today, compared at the same tier wherever both list one. The better value in each row is highlighted.
| Fact | Claude Opus 5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Price | ||
| Price per 1M input tokens | $4 | Not listed |
| Price per 1M output tokens | $20 | Not listed |
| Independent benchmarks | ||
| Arena Text | 1509 Elo (#2 of 51) (better) | 1487 Elo (#10 of 51) |
| Arena WebDev | 1810 Elo (#1 of 45) (better) | 1447 Elo (#36 of 45) |
| FrontierMath Tiers 1-3 (v2) | 91.2% (#3 of 42) (better) | 59.6% (#30 of 42) |
| GPQA Diamond | 90.6% (#25 of 41) | 94.4% (#6 of 41) (better) |
| SimpleQA Verified | 72.2% (#5 of 38) | 73.5% (#4 of 38) (better) |
| Specs | ||
| Provider | Anthropic | |
| Release date | September 22, 2026 | February 19, 2026 |
| Access | API only | API only |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Max output | 128,000 tokens | 65,536 tokens |
| Input | text, image | text, image, audio, video |
| Output | text | text |
Charts
Against every current text model
Where Claude Opus 5.5 and Gemini 3.1 Pro Preview land among the current models of their task, on every independent benchmark, on price and on context.
Where each stands
On Arena Text, Claude Opus 5.5 ranks #2 and Gemini 3.1 Pro Preview #10 of 51 current models. Each bar is the share of current models it beats: on score, price and context.
Independent benchmarks
Arena Text
Claude Opus 5.5:#2of 51
1,509 Elo · ahead of 98%
Gemini 3.1 Pro Preview:#10of 51
1,487 Elo · ahead of 82%
Arena WebDev
Claude Opus 5.5:#1of 45
1,810 Elo · ahead of 100%
Gemini 3.1 Pro Preview:#36of 45
1,447 Elo · ahead of 20%
FrontierMath Tiers 1-3 (v2)
Claude Opus 5.5:#3of 42
91.2% · ahead of 95%
Gemini 3.1 Pro Preview:#30of 42
59.6% · ahead of 29%
GPQA Diamond
Claude Opus 5.5:#25of 41
90.6% · ahead of 40%
Gemini 3.1 Pro Preview:#6of 41
94.4% · ahead of 88%
SimpleQA Verified
Claude Opus 5.5:#5of 38
72.2% · ahead of 89%
Gemini 3.1 Pro Preview:#4of 38
73.5% · ahead of 92%
Price and context
Price per 1M input tokens
Claude Opus 5.5:#43of 52
$4 · cheaper than 14%
Gemini 3.1 Pro Preview: Not listed
Price per 1M output tokens
Claude Opus 5.5:#43of 52
$20 · cheaper than 14%
Gemini 3.1 Pro Preview: Not listed
Context window
Claude Opus 5.5:#26of 64
1M tokens · longer than 22%
Gemini 3.1 Pro Preview:#11of 64
1.05M tokens · longer than 67%
Quality against price
Claude Opus 5.5 scores 1,509 at $8 (blended price per 1M tokens). The line joins the current models no other beats on both price and Arena Text score; hover any point to name it.
Quality against price: the data
| Model | Provider | Blended price per 1M tokens | Arena Text (Elo) |
|---|---|---|---|
| Gemini 4 Argon | $4 | 1,520 | |
| Claude Opus 5.5 | Anthropic | $8 | 1,509 |
| Muse Wonder | Meta | $8 | 1,507 |
| Claude Fable 5 | Anthropic | $20 | 1,504 |
| Claude Fable 5.1 | Anthropic | $20 | 1,504 |
| Gemini 3.8 Flash | $1.50 | 1,496 | |
| Muse Spark 1.3 | Meta | $2 | 1,495 |
| Claude Opus 5 | Anthropic | $10 | 1,492 |
| Kimi K3 | Moonshot Kimi | $6 | 1,488 |
| GPT-5.6 Sol | OpenAI | $8 | 1,485 |
| Gemini 3.6 Flash | $3 | 1,483 | |
| GPT-5.5 | OpenAI | $11 | 1,482 |
| Claude Opus 4.8 | Anthropic | $10 | 1,482 |
| Qwen3.8-Max | Alibaba Qwen | $3 | 1,482 |
| GPT-6.1 Sol | OpenAI | $4 | 1,481 |
| GLM-5.3 | Z.ai | $2.15 | 1,481 |
| MiMo-V2.6-Pro | Xiaomi MiMo | $0.54 | 1,480 |
| Claude Sonnet 5.5 | Anthropic | $4 | 1,477 |
| GLM-5.3-Flash | Z.ai | $0.24 | 1,477 |
| GPT-6 Astra | OpenAI | $20 | 1,476 |
| DeepSeek-V4.1-Flash | DeepSeek | $0.52 | 1,476 |
| GPT-5.4 | OpenAI | $5.63 | 1,475 |
| Gemini 3 Flash Preview | $1.13 | 1,473 | |
| Grok 4.20 | xAI | $1.56 | 1,472 |
| GPT-5.6 Terra | OpenAI | $4.50 | 1,467 |
| Grok 4.5 | xAI | $3 | 1,465 |
| DeepSeek-V4-Pro | DeepSeek | $1.98 | 1,465 |
| Claude Sonnet 5 | Anthropic | $4 | 1,462 |
| GPT-6 Sol | OpenAI | $4 | 1,458 |
| Gemini 3.5 Flash-Lite | $0.85 | 1,456 | |
| Grok 4.6 | xAI | $3 | 1,455 |
| GPT-5.6 Luna | OpenAI | $0.45 | 1,453 |
| MiMo-V2.6-Flash | Xiaomi MiMo | $0.18 | 1,448 |
| Step 5 Preview | StepFun | $1.43 | 1,448 |
| Grok 4.3 | xAI | $1.56 | 1,442 |
| GPT-6 Luna | OpenAI | $0.20 | 1,441 |
| Grok 4.7 | xAI | $3 | 1,441 |
| Mistral Large 4 | Mistral AI | $1.05 | 1,432 |
| Claude Haiku 5.5 | Anthropic | $0.20 | 1,425 |
| GPT-4.1 | OpenAI | $3.50 | 1,415 |
| Solar Pro 4 | Upstage | $0.52 | 1,388 |
| GPT-4.1 mini | OpenAI | $0.70 | 1,383 |
| GPT-4.1 nano | OpenAI | $0.18 | 1,322 |
Cost
What each costs
Example workloads at each provider's listed rates, then every other rate either one lists. The cheaper figure in each row is highlighted.
| Workload or rate | Claude Opus 5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Other listed rates | ||
| 1M input tokens, cached | $0.20 | Not listed |
| 1M input tokens, 5-minute cache write | $5 | Not listed |
| 1M input tokens, 1-hour cache write | $8 | Not listed |
| 1M input tokens, batch | $2 | Not listed |
| 1M output tokens, batch | $10 | Not listed |
| 1M input tokens, cached, prompts over 200K tokens | Not listed | $0.40 |
| 1M input tokens, cached, prompts up to 200K tokens | Not listed | $0.20 |
| 1M input tokens, prompts over 200K tokens | Not listed | $4 |
| 1M output tokens, prompts over 200K tokens | Not listed | $18 |
| 1M input tokens, prompts up to 200K tokens | Not listed | $2 |
| 1M output tokens, prompts up to 200K tokens | Not listed | $12 |
Your own bill will differ. These figures use list prices and example workloads. The AI Model Cost Audit reviews your real usage, shortlists models that score as well for each task for less, and estimates the savings.
Launch price $100, regular price $150
Verdict
When to choose each
Claude Opus 5.5
Where it leads
- Higher Arena Text score, 1509 Elo vs 1487 Elo
- Higher Arena WebDev score, 1810 Elo vs 1447 Elo
- Higher FrontierMath Tiers 1-3 (v2) score, 91.2% vs 59.6%
- Longer responses, up to 128,000 vs 65,536 output tokens
- A cached-input rate, $0.20 per 1M tokens
- Batch pricing, $2 input and $10 output per 1M tokens
Best for
- Long-running agentic coding and knowledge work as the general-purpose default
- Cache-heavy agent loops where the 0.05x read multiplier compounds
Watch out for
- The API effort default is medium here, not high as on Claude Fable 5.1 and Claude Sonnet 5.5, so a like-for-like comparison has to set effort explicitly
- The 4.7-generation tokenizer produces roughly 30% more tokens for the same text than Claude Sonnet 4.6 and earlier, so per-token rates do not compare directly across generations
Gemini 3.1 Pro Preview
Where it leads
- Higher GPQA Diamond score, 94.4% vs 90.6%
- Higher SimpleQA Verified score, 73.5% vs 72.2%
- Accepts audio and video input
Best for
- Multimodal reasoning and agentic coding evaluations
Watch out for
- This preview endpoint may change before becoming stable; production use should account for its published prompt-length price tiers
From benchmark to production
Building on Claude Opus 5.5 or Gemini 3.1 Pro Preview?
Public scores rarely hold on your own data. We test both models on your real tasks, then build the agent or pipeline around the one that wins.
AI Model Cost AuditLaunch price $100, regular price $150What the audit includes
FAQ
Claude Opus 5.5 vs Gemini 3.1 Pro Preview FAQ
Do Claude Opus 5.5 and Gemini 3.1 Pro Preview discount cached input?
Claude Opus 5.5 lists a cached-input rate of $0.20 per 1M tokens, 95% below its standard input rate. No cached-input rate is listed for Gemini 3.1 Pro Preview.
Which scores higher on independent benchmarks, Claude Opus 5.5 or Gemini 3.1 Pro Preview?
Claude Opus 5.5 leads on Arena Text, 1509 Elo to 1487 Elo; Claude Opus 5.5 leads on Arena WebDev, 1810 Elo to 1447 Elo; Claude Opus 5.5 leads on FrontierMath Tiers 1-3 (v2), 91.2% to 59.6%. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, Claude Opus 5.5 or Gemini 3.1 Pro Preview?
Both accept about 1.05M tokens of context (1,048,576 and 1,000,000). Claude Opus 5.5 returns up to 128,000 tokens per response, Gemini 3.1 Pro Preview 65,536.
How do Claude Opus 5.5 and Gemini 3.1 Pro Preview differ in features?
Claude Opus 5.5 takes text and image input; Gemini 3.1 Pro Preview takes text, image, audio and video.
Further reading
More on Claude Opus 5.5 and Gemini 3.1 Pro Preview
Articles on Claude Opus 5.5 and Gemini 3.1 Pro Preview
- GDPval-AA Chart Fact-Check: Opus 5.5 vs GPT-6 Astra on CostSeptember 24, 2026
- GPT-6 Sol vs Claude Opus 5.5, Plus Luna: Best Value per TaskSeptember 24, 2026
- Claude Opus 5.5 Benchmarks: What the Chart Shows and HidesSeptember 23, 2026
- Claude Opus 5.5: Tops the Independent Index at a Lower PriceSeptember 23, 2026
Related comparisons
- Claude Haiku 5.5 vs Claude Opus 5.5
- Claude Haiku 5.5 vs Gemini 3.1 Pro Preview
- Claude Opus 5.5 vs Mistral Large 4
- Gemini 3.1 Pro Preview vs Gemini 4 Argon
- Claude Opus 5.5 vs Gemini 4 Argon
- Gemini 3.1 Pro Preview vs GPT-6.1 Sol
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Sonnet 5.5 vs Gemini 3.1 Pro Preview
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Gemini 3.1 Pro Preview vs Gemini 3.8 Flash
- Claude Fable 5 vs Claude Opus 5.5
- Gemini 3.1 Pro Preview vs Grok 4.20
Production evaluation
Choosing between Claude Opus 5.5 and Gemini 3.1 Pro Preview?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty