How does Claude Opus 4.8 rank among AI models?
Claude Opus 4.8 is a superseded version and is not on the current board as of 22 September 2026. Its archive position, where one exists, is shown on the page; the newer version carries the current rank.
Anthropic·anthropic/claude-opus-4.8
Claude Opus 4.8 is ModelCap archive rank #17 (Measured), from the ModelCap Index as of 22 Sept 2026, 02:49 UTC.
Claude Opus 4.8 listed OpenRouter input price is $5.00 per 1M tokens and listed output price is $25.00 per 1M tokens, from OpenRouter listed prices as of 22 Sept 2026, 02:49 UTC.
Claude Opus 4.8 has a published context limit of 1M tokens in the ModelCap catalogue as of 22 Sept 2026, 02:49 UTC.
Claude Opus 4.8 has 11 published OpenRouter serving endpoints, from OpenRouter as of 22 Sept 2026, 02:49 UTC.
Claude Opus 4.8 weight access is api only, from ModelCap classification of published repository metadata as of 22 Sept 2026, 02:49 UTC.
Snapshot facts · download the public dataset · methodology
ModelCap Index · All-versions archive
81.6#17
Measured · 90% support · score interval 76.0–87.2
Evidence as of 21 Sept 2026, 17:21 UTC
Superseded by Claude Opus 5. It no longer holds a current-board position; its all-versions archive rank is #17.
Input
$5.00
per 1M tokens
Output
$25.00
per 1M tokens
Context
1M
tokens
Providers
11
endpoints
Gateway spend
8.14%
latest · Vercel share
Providers
Uptime measured over the last 30 minutesReasoning efforts
Best supported result can inform ModelCapPublished Max, X-High, High and other configurations for this model. These are sourced scores, not head-to-head essays.
Related community configurations
Human preference ratingOther versions (6)
ModelCap Index · All-versions archive
Methodology81.6
Measured · 7 public benchmark observations across 7 boards
All-versions archive
#17
- Public rank basis
- Measured (measured)
- Index support
- 90.3% · strong
- Index interval
- 76.0–87.2
- Rank posterior
- Not available
- Top 5 / Top 10 probability
- Not available / Not available
- Posterior as of
- Snapshot timestamp unavailable
- Evidence as of
- 21 Sept 2026, 17:21 UTC
- Identity binding
- Exact catalogue product · anthropic/anthropic/claude-opus-4.8 · aggregates disclosed benchmark configurations · endpoint configuration not claimed
- Index observations used
- 7
- Qualified Index evidence point
- 81.6
Bayesian Evidence Score · measured evidence input only
BES normalizes admitted public benchmark evidence for measured Index rows. Its legacy score and observables prior do not define the public language rank.
- Observed capability
- 81.6
- Evidence status
- confirmed · 97% mass
- General preference
- 82.9
- Coding
- 83.7
- Agents & tools
- 71.3
- Reasoning
- 56.5
- Evidence breadth
- 100%
- Evidence coverage
- 90%
Market and catalogue signals · secondary, never the language Index rank
- Usage (OpenRouter popularity)
- 37.0
- Liquidity (providers × uptime)
- 99.7
- Open reach (HF downloads)
- —
- Surface (context / tools / modalities)
- 100.0
- Freshness
- 64.0
- · OpenRouter popularity #38
- · 5 live providers
- · Catalogue: context 1000000, reasoning, tools, modalities Text/Image/File
- · First seen 2026-05-27
These adoption and deployment observations remain context only. They do not change this model's ModelCap Index score or rank.
BES evidence selected · measured input only
- Arena Overall · High83.5
- Artificial Analysis Intelligence Index · intelligence-index:v4.3:max80.8
- Arena Coding · High83.7
- LMArena Agent · High72.8
- WildClawBench OpenClaw68.2
- ARC-AGI-2 Verified · High63.5
- ARC-AGI-3 Verified · High40.3
The bounded 0–100 capability score blends each source’s competitive placement with its published achievement, then combines capability families. Evidence breadth adds a modest uncertainty adjustment; price and popularity are not part of benchmark-led rank.
Deployment readiness
Metadata index54.0
partial · 56% metadata coverage
- Artifact reproducibility
- 0.0
- Access & legal clarity
- 30.3
- Deployability
- 99.8
- Evaluation provenance
- 89.9
Missing: artifactReproducibility.revision-sha, artifactReproducibility.architecture-and-model-type, artifactReproducibility.parameter-count, artifactReproducibility.serialized-weight-format, artifactReproducibility.base-lineage, accessLegalClarity.declared-license, accessLegalClarity.resolvable-license-terms, evaluationProvenance.evaluation-dataset-revisions.
A metadata completeness and deployability index—not a safety certification, quality grade, or production-readiness claim.
Market activity
Venue coverage- Market Gravity
- 56.0
- OpenRouter weekly popularity
- #38 of 322
- Vercel token share · 7d
- 1.74%
- Venue data through
- 2026-09-22
Market Gravity uses OpenRouter’s full-catalogue popularity order. Sparse Vercel top-ten observations appear only when published and do not affect the score.
Arena preference
- Status
- Ranked
- Source
- LMArena
- Official rank
- #35 of 402
- Rating
- 1473.2
- 95% confidence interval
- 1469–1477
- Votes
- 53K
- Source published at
- 13 Sept 2026, 00:00 UTC
- Category
- overall
- Identity match confidence
- 100%
Market Gravity breakdown
- Usage55%
- 37.0
- Liquidity25%
- 99.7
- Open reach15%
- 50.0
- Freshness5%
- 64.0
OpenRouter weekly popularity across the full model catalogue.
Independent providers versus the model's open or closed cohort, weighted by uptime.
Hugging Face 30-day downloads for open models; neutral for closed models.
Time since first public availability, on a six-month half-life.
Specification
- Context window
- 1M tokens
- Max output
- 128K tokens
- Inputs
- Text, Image, File
- Outputs
- Text
- Tokenizer
- Claude
- Cached input tokens
- $0.50 / 1M
- First seen on OpenRouter
- 27 May 2026
Capabilities
- Supported: Reasoning
- Supported: Tool use
- Supported: Structured output
- Supported: Response format
- Not supported: Moderated
Benchmark leaderboards featuring Claude Opus 4.8
All leaderboardsClaude Opus 4.8: common questions
How much does Claude Opus 4.8 cost per 1M tokens?
Claude Opus 4.8 is listed at $5.00 per 1M input tokens and $25.00 per 1M output tokens as of 22 September 2026 across 5 providers. Prices come from the OpenRouter catalogue and re-observe on every refresh. For 1,000 requests using 2,000 input and 500 output tokens each, the listed rates imply $22.50 total (2M input + 0.5M output). This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the chosen endpoint's rate and limits before budgeting.
What is the context window of Claude Opus 4.8?
Claude Opus 4.8 has a published context window of 1M tokens (1,000,000) and a maximum output of 128K tokens. Individual providers can serve less than the published maximum; the providers table lists each endpoint's own limit.
Is Claude Opus 4.8 open-weight?
API only. No downloadable model weights are linked in the current source data; access is through a hosted API or product.
Which API providers serve Claude Opus 4.8?
5 providers serve Claude Opus 4.8 through OpenRouter as of 22 September 2026: Claude Platform on AWS, Azure, Amazon Bedrock, Google and Anthropic. Each provider's price, context limit, quantization and measured uptime are in the providers table above.
Which benchmarks has Claude Opus 4.8 been evaluated on?
Claude Opus 4.8 has published results on 9 public boards tracked by ModelCap as of 22 September 2026: Arena coding 1533 (#11 of 397), LMArena Agent 8.2% (#6 of 46), ARC-AGI-2 72.1% (#34 of 214), ARC-AGI-3 1.5% (#18 of 39) and AA Intelligence Index 41.8 (#33 of 151) and more. Each board page ranks every tracked model on that benchmark; the ModelCap Index combines them with published uncertainty.
When was Claude Opus 4.8 released?
Claude Opus 4.8 first appeared in the catalogue on 27 May 2026. It has since been superseded by Claude Opus 5. Rank and price movements since then are recorded on the site's changes feed.