One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $5 = $5.00
- Output0.1M x $25 = $2.50
$7.50per session
Anthropic - Closed weights
Claude Opus 4.5 pricing and specs
Claude Opus 4.5 is a closed-weights model from Anthropic that costs $5 per 1M input tokens and $25 per 1M output tokens on the first-party API, with a 200K-token context window.
Last verified from platform.claude.com. All sources
- Input / 1M
- $5
- Output / 1M
- $25
- Context
- 200K tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| Input | $5 |
| Output | $25 |
| Cache read | $0.50 |
| Cache write (5 minutes) | $6.25 |
| Cache write (1 hour) | $10 |
| Batch inputBatch requests | $2.50 |
| Batch outputBatch requests | $12.50 |
Note: Legacy model, still sold. Claude API alias is claude-opus-4-5. 200K context window. Retirement not sooner than 2026-11-24 per the deprecations page.
Specs
- Context window
- 200,000 tokens
- Max output
- 64,000 tokens
- Release date
- Provider
- Anthropic
- API model id
claude-opus-4-5-20251101- Vercel AI Gateway id
anthropic/claude-opus-4.5- Weights
- Closed weights
What Claude Opus 4.5 costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $5 = $100.00
- Output5M x $25 = $125.00
$225.00per day
$6,750.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $0.50 = $0.45
- Uncached input0.1M x $5 = $0.50
- Output0.1M x $25 = $2.50
$3.45per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Claude Opus 4.5 (this page) | $5 | $25 |
| Claude Opus 4.6Anthropic | $5 | $25 |
| Claude Opus 4.7Anthropic | $5 | $25 |
| Claude Opus 4.8Anthropic | $5 | $25 |
| Claude Opus 5Anthropic | $5 | $25 |
| Claude Opus 5.5Anthropic | $4 | $20 |
| Claude Sonnet 4.5Anthropic | $3 | $15 |
Related reading
- VibeThinker-3B: A 3 Billion Parameter Model That Outscores Opus 4.5 on ReasoningVibeThinker-3B is a 3B parameter reasoning model reporting 94.3% on AIME 2026. What the paper claims, how to run it locally, and what it trades away.
- Claude Opus 4.5: Anthropic's Most Intelligent ModelClaude Opus 4.5 is the Anthropic model built for coding agents and computer use. Its pricing, benchmarks, token efficiency, effort parameter and agent features.
- Claude Agent SDK in Late 2026: What Is New and How to Use ItWhat changed in the Claude Agent SDK by October 2026: nested subagents with caps, SessionStore, skills, plugins, structured outputs and permission defaults.
- Claude API OpenTelemetry Tracing: How to Set It Up (Beta)The Claude API now exports OpenTelemetry traces in beta. Set up SDK spans in code, add a Console destination for API spans, and count tokens once.
- Claude Code Idle Compaction: What It Does and How to Turn It OffClaude Code 2.1.299 compacts sessions over 200K tokens after about 54 idle minutes. How the cache math works, the setting to turn it off, and when to keep it.
- Tool Calling Under the Hood: Claude Messages vs OpenAI ResponsesHow tool calling works on the wire: JSON schema tools, parallel calls, tool_choice, strict mode and streaming deltas in Claude Messages vs OpenAI Responses.
FAQ
How much does Claude Opus 4.5 cost per million tokens?
Claude Opus 4.5 costs $5 per 1M input tokens and $25 per 1M output tokens on Anthropic's first-party API, per platform.claude.com on October 17, 2026. Per 1M tokens, cache reads cost $0.50, and the batch rate is $2.50 input and $12.50 output.
What is Claude Opus 4.5's context window?
Claude Opus 4.5 has a 200,000-token context window and returns up to 64,000 output tokens per response.
Are Claude Opus 4.5's weights open?
No. Claude Opus 4.5 is a closed-weights model. You call it through Anthropic's API as claude-opus-4-5-20251101 or through Vercel AI Gateway as anthropic/claude-opus-4.5.
When was Claude Opus 4.5 released?
Anthropic released Claude Opus 4.5 on November 24, 2025.
Sources
Last verified from platform.claude.com.
- https://platform.claude.com/docs/en/about-claude/pricing
- https://platform.claude.com/docs/en/models/opus-4-5/overview
- https://platform.claude.com/docs/en/about-claude/models/overview
- https://platform.claude.com/docs/en/release-notes/overview
- https://platform.claude.com/docs/en/about-claude/model-deprecations
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