Claude Opus 4.8
Explore benchmark scores, genre strengths, weaknesses, and recent examples for Claude Opus 4.8 on Orivel.
Model Overview
Released
2026-05-28
Context
1M tokens
Input
$5.00 / 1M
Output
$25.00 / 1M
Max output
128k tokens
Retired from new Orivel comparisons on July 24, 2026, when Claude Opus 5 replaced it at the identical price. Past results stay published.
Claude Opus 4.8, released May 28, 2026, was Anthropic's flagship until Claude Fable 5 took the top spot on June 9, 2026, after which it held Orivel's Anthropic balanced slot. The headline gains over Opus 4.7 were sharper judgement, more honesty about its own progress, and the ability to work independently for longer — it is around four times less likely than its predecessor to let flaws in its own code pass unremarked.
Benchmarks
| Measure | Opus 4.8 | Note |
|---|---|---|
| SWE-Bench Pro | 69.2% | ahead of GPT-5.5 and Gemini 3.1 Pro |
Specs and pricing
| Item | Opus 4.8 |
|---|---|
| Context window | 1M tokens |
| Max output | 128k tokens, on the Messages API |
| Knowledge cutoff | January 2026 |
| Input / 1M | $5 (unchanged from Opus 4.7) |
| Output / 1M | $25 (unchanged from Opus 4.7) |
effort control |
New in this release, defaults to high |
| Dynamic Workflows | Research preview, for large parallelised agentic tasks |
Retirement notes
- Released May 28, 2026 as the successor to Claude Opus 4.7 (about six weeks later)
- Sharper judgement, more honesty about its own progress, and longer independent work
- ~4x less likely than Opus 4.7 to let flaws in its own code pass unremarked
- SWE-Bench Pro 69.2% — ahead of GPT-5.5 and Gemini 3.1 Pro on agentic coding
- Gains across multidisciplinary reasoning, agentic computer use, and agentic financial analysis
- 1M-token context window; up to 128k output tokens on the Messages API
- `effort` parameter (defaults to high) to tune how hard the model works per response
- Dynamic Workflows research preview for large, parallel-subagent tasks; fast mode at 2.5x speed
- Pricing unchanged from Opus 4.7: $5 input / $25 output per 1M tokens
- Adaptive thinking; available across Claude API, Amazon Bedrock, Vertex AI, and Microsoft Foundry
- Knowledge and training data cutoff: January 2026
Specs across the current lineup
Published specs and pricing, comparable before any benchmark data exists.
| Model | Context | Max output | Input / 1M | Output / 1M |
|---|---|---|---|---|
| openai GPT-6 Astra | — | 128k | $10.00 | $50.00 |
| google Gemini 3.8 Flash | — | 66k | $0.75 | $3.75 |
| anthropic Claude Fable 5.1 | 1M | 128k | $10.00 | $50.00 |
| google Gemini 3.5 Flash-Lite | — | 66k | $0.30 | $2.50 |
| openai GPT-5.6 | 1M | 128k | $4.00 | $20.00 |
| anthropic Claude Opus 5 | 1M | 128k | $5.00 | $25.00 |
| openai GPT-5 mini | 400k | 128k | $0.25 | $2.00 |
| google Gemini 3.1 Flash-Lite | — | 66k | $0.25 | $1.50 |
| anthropic Claude Sonnet 5 | 1M | 128k | $2.00 | $10.00 |
Overall Performance
Overall Rank
-
Overall win rate
Average Score
Wins
44
Sample Count
54
Win Rate by Model
Compare by Genre
Strong Genres
Counseling
Win Rate
Sample Count
2
Genre Rank
2 / 17
Wins
2
Creative Writing
Win Rate
Sample Count
1
Genre Rank
3 / 16
Wins
1
Analysis
Win Rate
Sample Count
1
Genre Rank
1 / 17
Wins
1
Business Writing
Win Rate
Sample Count
2
Genre Rank
5 / 17
Wins
2
Discussion
Win Rate
Sample Count
28
Genre Rank
7 / 18
Wins
25
Weaker Genres
Idea Generation
Win Rate
Sample Count
1
Genre Rank
13 / 16
Wins
0
Brainstorming
Win Rate
Sample Count
2
Genre Rank
9 / 15
Wins
1
Planning
Win Rate
Sample Count
1
Genre Rank
10 / 15
Wins
0
Strength by Evaluation Criteria
Average score by criterion (out of 10)
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