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AnthropicClaude 5 familyLegacyReasoning modelReleased 24 Jul 2026

Claude Opus 5

Previous Opus. Migrate to claude-opus-5-5.

Model idclaude-opus-5

Price$5 in, $25 out per 1M tokens

Checked29 September 2026

Knows up to May 2026

1,829events after its cutoff

82 historic, 419 major. 166 days of news.

It launched on 24 July 2026, already missing 95 of them.

Five things it has never heard of

How to call it

7 ways to use Claude Opus 5, with the model id each provider expects.

Providers, model ids, endpoints and docs for Claude Opus 5
ProviderModel idEndpointDocs
Anthropic API (Claude API) claude-opus-5 https://api.anthropic.com/v1/messages platform.claude.com
AWS Bedrock (Messages API / Mantle) anthropic.claude-opus-5 platform.claude.com
Google Cloud Vertex AI claude-opus-5 platform.claude.com
Microsoft Foundry (Azure) claude-opus-5 platform.claude.com
Claude Platform on AWS claude-opus-5 platform.claude.com
OpenRouter anthropic/claude-opus-5 openrouter.ai
Web app claude.ai

Pricing

Prices for Claude Opus 5
Input$5 per 1M tokens
Output$25 per 1M tokens
Cache read$0.50 per 1M tokens

As published: “per 1M tokens (USD); Batch API 50% off”.

Source: platform.claude.com, checked 29 September 2026.

Specs

Input
Text, images and PDF
Output
Text
Context window
1,000,000 tokens
Max output
128,000 tokens
Open weights
No
Licence
Proprietary
Training cutoff
May 2026
Released
24 July 2026
Status
Legacy
Type
Reasoning model

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Novel problem solving (ARC-AGI 3)

    Anthropic says it scored about 3x as high as competing models on ARC-AGI 3.

    Source: anthropic.com

  • Near-Fable coding at half the price

    Launch claim: more than doubles Opus 4.8 on Frontier-Bench and beats Fable 5 on OSWorld 2.0 at about a third of the cost.

    Source: anthropic.com

  • Self-built tooling

    In one demo it wrote its own vision pipeline to solve a FreeCAD reconstruction task.

    Source: anthropic.com

  • Thinking on by default

    First

    First Opus where omitting the thinking parameter runs adaptive thinking.

    Source: platform.claude.com

Four assistants, one scale

Claude Opus 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).

  1. GPT-6 Astra 271 at launch, 1,863 today
  2. Claude Opus 5.5 372 at launch, 1,795 today
  3. Gemini 4 Hydrogen 1,863 at launch, 1,889 today
  4. Grok 4.7 387 at launch, 1,829 today
  5. Claude Opus 5 95 at launch, 1,829 today
Show as a table
ModelCutoffReleasedMissing at launchMissing today
GPT-6 AstraApril 20263 September 20262711,863
Claude Opus 5.5June 202622 September 20263721,795
Gemini 4 HydrogenMarch 202612 November 20261,8631,889
Grok 4.7May 202621 September 20263871,829
Claude Opus 5May 202624 July 2026951,829

Notes

Superseded by claude-opus-5-5 (cheaper). Thinking on by default; {type: disabled} allowed only at effort high or below. Fast mode $10/$50 (Claude API only). Retirement not sooner than 2027-07-24.

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-opus-5","max_tokens":16000,"messages":[{"role":"user","content":"Hello"}]}'

Sources: