Claude Opus 4.8
Knows up to January 2026Missing 1,945 events
claude-opus-4-8
$5 in, $25 out per 1M tokens
Claude Sonnet 4.5
Legacy Sonnet; migrate to claude-sonnet-5-5.
Model idclaude-sonnet-4-5-20250929
Price$3 in, $15 out per 1M tokens
Checked2 October 2026
Knows up to January 2025
2,037events after its cutoff
90 historic, 476 major. 651 days of news.
It launched on 29 September 2025, already missing 43 of them. Coverage before 2026 is thin (80 entries for 2025), so this count is a floor.
Its cutoff, January 2025, is before this chart starts: every mark here is news it has never seen.
How to call it
7 ways to use Claude Sonnet 4.5, with the model id each provider expects.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Anthropic API (Claude API) | claude-sonnet-4-5-20250929Alias claude-sonnet-4-5 |
https://api.anthropic.com/v1/messages |
platform.claude.com |
| AWS Bedrock (InvokeModel) | anthropic.claude-sonnet-4-5-20250929-v1:0 |
platform.claude.com | |
| Google Cloud Vertex AI | claude-sonnet-4-5@20250929 |
platform.claude.com | |
| Microsoft Foundry (Azure) | claude-sonnet-4-5 |
platform.claude.com | |
| Claude Platform on AWS | claude-sonnet-4-5 |
platform.claude.com | |
| OpenRouter | anthropic/claude-sonnet-4.5 |
openrouter.ai | |
| Web app | claude.ai |
Pricing
| Input | $3 per 1M tokens |
|---|---|
| Output | $15 per 1M tokens |
| Cache read | $0.30 per 1M tokens |
As published: “per 1M tokens (USD); Batch API 50% off”.
Source: platform.claude.com, checked 2 October 2026.
Specs
- Input
- Text, images and PDF
- Output
- Text
- Context window
- 200,000 tokens
- Max output
- 64,000 tokens
- Open weights
- No
- Licence
- Proprietary
- Training cutoff
- January 2025
- Released
- 29 September 2025
- Status
- Deprecated
- Type
- Reasoning model
What stands out
What its maker marketed at launch, and what people found later, each with its source.
30+ hour autonomous tasks
Anthropic reported it maintained focus for more than 30 hours on complex multi-step tasks.
SOTA SWE-bench Verified at launch
77.2% on SWE-bench Verified; billed as ‘the best coding model in the world’ at release.
Computer use lead
61.4% on OSWorld, up from 42.2% for Sonnet 4.
Four assistants, one scale
Claude Sonnet 4.5 is added as a fifth row. Each row runs from what the model knows (graphite) through the months between its cutoff and its launch (hatched) to today (pink).
- GPT-6 Astra 271 at launch, 1,863 today
- Claude Opus 5.5 372 at launch, 1,795 today
- Gemini 4 Hydrogen 1,863 at launch, 1,889 today
- Grok 4.7 387 at launch, 1,829 today
- Claude Sonnet 4.5 43 at launch, 2,037 today
Show as a table
| Model | Cutoff | Released | Missing at launch | Missing today |
|---|---|---|---|---|
| GPT-6 Astra | April 2026 | 3 September 2026 | 271 | 1,863 |
| Claude Opus 5.5 | June 2026 | 22 September 2026 | 372 | 1,795 |
| Gemini 4 Hydrogen | March 2026 | 12 November 2026 | 1,863 | 1,889 |
| Grok 4.7 | May 2026 | 21 September 2026 | 387 | 1,829 |
| Claude Sonnet 4.5 | January 2025 | 29 September 2025 | 43 | 2,037 |
Notes
Snapshot claude-sonnet-4-5-20250929 (alias claude-sonnet-4-5). Extended thinking only. Training data cutoff Jul 2025. Deprecated on 2026-09-30; retirement on the Claude API scheduled for 2026-11-30 (Anthropic recommends migrating to Claude Sonnet 5.5). Source: https://platform.claude.com/docs/en/release-notes/overview
curl https://api.anthropic.com/v1/messages \
-H "x-api-key: $ANTHROPIC_API_KEY" -H "anthropic-version: 2023-06-01" -H "content-type: application/json" \
-d '{"model":"claude-sonnet-4-5","max_tokens":16000,"messages":[{"role":"user","content":"Hello"}]}'
Sources:
- Model page: https://platform.claude.com/docs/en/models/sonnet-4-5/overview
- Announcement: https://www.anthropic.com/news/claude-sonnet-4-5
- Pricing: https://platform.claude.com/docs/en/about-claude/pricing
- Models overview: https://platform.claude.com/docs/en/about-claude/models/overview
- Deprecations: https://platform.claude.com/docs/en/about-claude/model-deprecations