Claude Opus 4.5
AnthropicProprietaryReleased Nov 24, 2025
Claude Opus 4.5 is not on the arena.ai Agents leaderboard, so it has no rank on our default leaderboard; the other data below is for reference. Claude Opus 4.5 ranks #49 on the LMArena Text leaderboard (style control) with an Arena score of 1469.7 (±3.2, 72,825 votes). API price: $5.00 input / $25.00 output per 1M tokens. Context: 200K. Nearest rivals: Claude Sonnet 4.6 (1472.0) above and GPT-5.6 Terra (1467.3) below.
Quick answer
- Agents leaderboard
- No result yet
- Text (LMArena)
- #49 · 1469.7
- API price (in / out)
- $5.00 / $25.00 per 1M tokens
- Closest rival
- Claude Sonnet 4.6 · 1472.0
- Cheaper alternative
- Gemini 3.6 Flash: Text 1483.2, output $3.75 (85% cheaper)
- Data updated
- Oct 29, 2026 · synced daily
Sources: arena.ai, LMArena, Artificial Analysis, OpenRouter
Key metrics
Rank history
LMArena rank, last 14 days#48 on Oct 16, #49 now; best #48 in this period.
Models ranked nearby
Sorted by Arena score| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 34 |  Qwen3.7 Max | 1473.7 | – | $7.50 | – |
| 35 |  Gemini 3 Flash | 1472.7 | – | $3.00 | – |
| 36 | Claude Sonnet 4.6 | 1472.0 | – | $15.00 | – |
| 37 | Claude Opus 4.5This page | 1469.7 | – | $25.00 | – |
| 38 |  GPT-5.6 Terra | 1467.3 | – | $12.00 | 114 |
| 39 |  MiMo V2.5 Pro | 1466.6 | – | $1.02 | – |
| 40 |  Grok 4.5 | 1465.4 | – | $6.00 | – |
More from Anthropic
| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 3 | Claude Opus 5.5 | 1508.7 | 58.4 | $20.00 | 96 |
| 5 | Claude Fable 5.1 | 1504.4 | 49.0 | $50.00 | 67 |
| 6 | Claude Fable 5 | 1503.9 | – | $50.00 | – |
| 7 | Claude Opus 4.6 | 1503.2 | – | $25.00 | – |
| 8 | Claude Opus 4.7 | 1501.0 | – | $25.00 | – |
| 12 | Claude Opus 5 | 1491.6 | – | $25.00 | – |
Pricing
- Official API list price: $5.00 input and $25.00 output per 1M tokens (USD).
- At a typical 3:1 input-to-output ratio, the blended cost is about $10.00 per 1M tokens.
- Among 67 models with an output price, it is the #58 cheapest.
- The cheapest OpenRouter route charges $5.00 input / $25.00 output.
Sources & methodology
Claude Opus 4.5 is not on the arena.ai Agents leaderboard, so it has no rank on our default leaderboard; the other data below is for reference.
- arena.ai Agents — agent Net Improvement, 95% interval, sessions and rank (via the public Hugging Face dataset, CC BY 4.0).
- LMArena — Arena score (Text leaderboard with style control, the same view arena.ai shows by default), 95% confidence interval, votes and rank.
- Artificial Analysis — Intelligence / Coding Index, output speed and latency (medians).
- OpenRouter — Route prices, context length and listing date.
Arena scores use the Bradley-Terry model (not Elo); ± is the half-width of the 95% confidence interval. Latency figures are Artificial Analysis medians; for reasoning models, time to first token and to first answer include the thinking phase. Data syncs daily at 14:20 (UTC+8).
Limits: Arena scores come from anonymous users voting on chats, so they reflect conversational preference rather than agent or coding benchmarks; with few votes the interval is wide and ranks move. Prices and speeds change as providers update them.
FAQ
What rank is Claude Opus 4.5 right now?
Claude Opus 4.5 is #37 on our leaderboard of 63 scored models (Arena score 1469.7); its raw LMArena rank is #49.
What does Claude Opus 4.5 cost via API?
Input $5.00 / output $25.00 per 1M tokens (official API list price; the OpenRouter quote when no official price is available). At a typical 3:1 input-to-output ratio, the blended cost is about $10.00 per 1M tokens.
How close is Claude Opus 4.5 to the models ranked next to it?
It is 2.3 points behind Claude Sonnet 4.6 (1472.0) and 2.4 points ahead of GPT-5.6 Terra (1467.3); gaps smaller than the confidence interval (±3.2) are not significant.
Is Claude Opus 4.5 open source? Can it be self-hosted?
Claude Opus 4.5 is a closed model, available only via official APIs or hosted services.
What is the context length of Claude Opus 4.5?
200K (200,000 tokens, as listed on OpenRouter).
Claude Opus 4.5 vs Claude Sonnet 4.6: which is better?
On the LMArena Text leaderboard Claude Opus 4.5 scores 1469.7 and Claude Sonnet 4.6 scores 1472.0 (a 2.3-point gap, within the confidence interval, so not significant). On price, Claude Opus 4.5 costs $25.00 and Claude Sonnet 4.6 $15.00 per 1M output tokens.
Is there a cheaper model close to Claude Opus 4.5?
Yes: Gemini 3.6 Flash scores 1483.2 on the Text leaderboard (Claude Opus 4.5: 1469.7) and costs $3.75 per 1M output tokens, about 85% less than Claude Opus 4.5 ($25.00).
Where does the Claude Opus 4.5 data come from and how often is it updated?
Agent success rates come from the arena.ai Agents leaderboard (CC BY 4.0), Text scores from LMArena, intelligence and speed from Artificial Analysis, and prices and context from official list prices and OpenRouter. 17NAS syncs daily at 06:20 UTC; this page was last updated Oct 29, 2026.