Claude Opus 5
AnthropicProprietaryReleased Jul 24, 2026
On the arena.ai Agents leaderboard, Claude Opus 5 has a task success rate of 8.09% (Max, rank #9, 95% interval 6.43%–9.75%). Claude Opus 5 ranks #13 on the LMArena Text leaderboard (style control) with an Arena score of 1491.1 (±4.8, 33,683 votes). Artificial Analysis Intelligence Index: 50.8. API price: $5.00 input / $25.00 output per 1M tokens. Context: 1M. Nearest rivals: Muse Spark 1.2 (1492.0) above and Muse Spark 1.1 (1490.4) below.
Quick answer
- Agents leaderboard
- #9 of 45 · 8.09% success
- Text (LMArena)
- #13 · 1491.1
- 17NAS overall
- #9 of 86
- API price (in / out)
- $5.00 / $25.00 per 1M tokens
- Closest rival
- Muse Spark 1.2 · 1492.0
- Cheaper alternative
- Gemini 3.8 Flash: Text 1496.3, output $3.75 (85% cheaper)
- Data updated
- Oct 22, 2026 · synced daily
Sources: arena.ai, LMArena, Artificial Analysis, OpenRouter
Key metrics
Reasoning effort comparison
Artificial Analysis measurements per reasoning effort of the same model| Effort | Intelligence | Coding | tok/s | TTFT (s) | First answer (s) |
|---|---|---|---|---|---|
| maxUsed in table | 50.8 | 78.0 | – | – | – |
| xhigh | 49.7 | 77.0 | – | – | – |
| high | 48.1 | 76.5 | – | – | – |
| medium | 44.8 | 74.3 | – | – | – |
| low | 39.4 | 66.9 | – | – | – |
Models ranked nearby
Sorted by Arena score| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 8 |  Gemini 3.8 Flash | 1496.3 | 40.9 | $3.75 | 144 |
| 9 |  Muse Spark 1.3 | 1494.7 | 48.1 | $4.25 | 113 |
| 10 | Muse Spark 1.2 | 1492.0 | 39.6 | $4.25 | – |
| 11 | Claude Opus 5This page | 1491.1 | 50.8 | $25.00 | – |
| 12 | Muse Spark 1.1 | 1490.4 | 33.7 | $4.25 | – |
| 13 | Muse Spark | 1489.0 | 31.3 | – | – |
| 14 | Gemini 3.7 Flash | 1488.9 | 39.1 | $3.75 | – |
More from Anthropic
| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 3 | Claude Opus 5.5 | 1508.8 | 57.6 | $20.00 | 98 |
| 4 | Claude Fable 5 | 1503.7 | 49.6 | $50.00 | – |
| 5 | Claude Opus 4.6 | 1502.6 | 31.9 | $25.00 | – |
| 6 | Claude Fable 5.1 | 1502.6 | 53.4 | $50.00 | 71 |
| 7 | Claude Opus 4.7 | 1501.0 | 40.7 | $25.00 | – |
| 22 | Claude Opus 4.8 | 1481.3 | 41.8 | $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 81 models with an output price, it is the #72 cheapest.
- The cheapest OpenRouter route charges $5.00 input / $25.00 output.
Sources & methodology
On the arena.ai Agents leaderboard, Claude Opus 5 has a task success rate of 8.09% (Max, rank #9, 95% interval 6.43%–9.75%).
- arena.ai Agents — agent task success rate, 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
How does Claude Opus 5 do on the Agents leaderboard?
On the arena.ai Agents leaderboard, Claude Opus 5 has a task success rate of 8.09% (Max, rank #9, 95% interval 6.43%–9.75%).
What rank is Claude Opus 5 right now?
Claude Opus 5 is #11 on our leaderboard of 69 scored models (Arena score 1491.1); its raw LMArena rank is #13.
What does Claude Opus 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 5 to the models ranked next to it?
It is 0.9 points behind Muse Spark 1.2 (1492.0) and 0.7 points ahead of Muse Spark 1.1 (1490.4); gaps smaller than the confidence interval (±4.8) are not significant.
Is Claude Opus 5 open source? Can it be self-hosted?
Claude Opus 5 is a closed model, available only via official APIs or hosted services.
What is the context length of Claude Opus 5?
1M (1,000,000 tokens, as listed on OpenRouter).
Claude Opus 5 vs Muse Spark 1.2: which is better?
On the LMArena Text leaderboard Claude Opus 5 scores 1491.1 and Muse Spark 1.2 scores 1492.0 (a 0.9-point gap, within the confidence interval, so not significant). Agent task success: Claude Opus 5 8.09%, Muse Spark 1.2 -6.75%. On price, Claude Opus 5 costs $25.00 and Muse Spark 1.2 $4.25 per 1M output tokens.
Is there a cheaper model close to Claude Opus 5?
Yes: Gemini 3.8 Flash scores 1496.3 on the Text leaderboard (Claude Opus 5: 1491.1) and costs $3.75 per 1M output tokens, about 85% less than Claude Opus 5 ($25.00).
Where does the Claude Opus 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 22, 2026.