Claude Opus 4.8
$5.00
$25.00
1M
2026-05-28
- Positioning
- Flagship, as the vendor describes it. The vendor has a newer generation.Source
- Price
- Level 4 of 4 among text models ($ is the cheapest), by output price per 1M tokens: $20 and up.
- Vendor-stated speed
- Moderate, compared with other Claude models.Source
Three separate signals, not a quality score.
Claude Opus 4.8 is Anthropic's Opus-tier model released May 28, 2026, building on Opus 4.7 as a more effective collaborator for agentic work. Anthropic reports it flags uncertainty more readily and is about four times less likely than its predecessor to let flaws in its own code go unmentioned. Anthropic's docs now list it as legacy but still available.
Anthropic's Claude Opus 4.8 model page lists a 1M-token context window and 128K max output tokens on the synchronous Messages API.
Pricing
Anthropic · Family · USD / 1M tokens
| Model | Input | Output |
|---|---|---|
| Claude Fable 5claude-fable-5 | $10.00 | $50.00 |
| Claude Opus 4.7claude-opus-4-7 | $5.00 | $25.00 |
| Claude Opus 4.8 This pageclaude-opus-4-8 | $5.00 | $25.00 |
| Claude Opus 5claude-opus-5 | $5.00 | $25.00 |
| Claude Sonnet 4.6claude-sonnet-4-6 | $3.00 | $15.00 |
| Claude Sonnet 5claude-sonnet-5 | $3.00 | $15.00 |
| Claude Haiku 4.5claude-haiku-4-5 | $1.00 | $5.00 |
Cost per 1,000 typical requests
| Workload | USD / 1,000 |
|---|---|
| Short chat turn800 / 400 | $14.00 |
| RAG answer4,000 / 500 | $32.50 |
| Agent step with tools20,000 / 1,500 | $137.50 |
Where it fits
- Long-running agentic coding where the model should check and flag its own work
- Review, audit, and verification tasks that reward calibrated uncertainty
- Tuning depth against speed per request with the effort setting (default high; xhigh and max available)
- High-volume short requests better priced on Sonnet or Haiku tiers
- Workloads that need a higher Claude capability ceiling (see Claude Fable 5)
Benchmarks
Scores as published by each vendor, not measured by ATP. Test conditions vary, so they are not directly comparable across vendors.
Same controls on every model: project keys, per-project model access, credit budgets, and a log of every request.Set up your organization
Cost estimator
- Input$50.00
- Output$50.00
$100.00 USD / month · 10,000 credits / month
Quickstart
from openai import OpenAI
client = OpenAI(
base_url="https://api.atptoken.ai/v1",
api_key="atp-•••"
)
r = client.chat.completions.create(
model="claude-opus-4-8",
messages=[{"role":"user","content":"hi"}],
)Compare with similar models
- GPT-5.5OpenAIPositioning: Flagship. Price level 4 of 4 among text models.$5.00 / $30.00In / out · per 1M tokens
- Kimi K3Moonshot (Kimi)Positioning: Flagship. Price level 3 of 4 among text models.$3.00 / $15.00In / out · per 1M tokens
- Gemini 3.1 Pro (Preview)GooglePositioning: Flagship. Price level 3 of 4 among text models.$2.00 / $12.00In / out · per 1M tokens
FAQ
- Can Claude Opus 4.8 use tools, read images, or think before answering?
- Claude Opus 4.8 supports tool calling, vision input and extended thinking, but not audio.
- How much context does Claude Opus 4.8 take?
- Anthropic lists a 1,000,000-token context window for Claude Opus 4.8. Source: Anthropic — Introducing Claude Opus 4.8. The model list your key can see shows the limit you actually get.
- Is cached input cheaper on Claude Opus 4.8?
- You pay per 1M input tokens and per 1M output tokens. Cached input costs 10% of the normal input price. Cache writes are priced separately. You only pay when a request succeeds. $1 = 100 credits. See pricing
- Is there a newer Anthropic model than Claude Opus 4.8 on ATP?
- Yes. Claude Opus 5 (claude-opus-5) came out on Jul 24, 2026, after Claude Opus 4.8 (May 28, 2026), and is the newer Anthropic text option on ATP. Both stay available: compare family prices on this page, then turn on the id you want for your project.
Sources
Start with $5. Credits never expire.
Create a project key, turn this model on, and pay only for what you use.