Migrating from claude-opus-4-1-20250805 to claude-opus-4-5-20251101

What changes when you move from claude-opus-4-1-20250805 to claude-opus-4-5-20251101: input price −66.7%, output price −66.7%.

From: claude-opus-4-1-20250805
Status: Retired
Shutdown: Aug 5, 2026
Time left: —

To: claude-opus-4-5-20251101
Status: Active
Shutdown: not before Nov 24, 2026
Time left: —

Prices

USD per 1M tokens, standard tier

Type	claude-opus-4-1-20250805	claude-opus-4-5-20251101	Change
Input	$15.00first seen October 1, 2026 · source	$5.00first seen October 1, 2026 · source	−66.7%
Cached input	$1.50first seen October 1, 2026 · source	$0.50first seen October 1, 2026 · source	−66.7%
Output	$75.00first seen October 1, 2026 · source	$25.00first seen October 1, 2026 · source	−66.7%

At 1M input and 250K output tokens a month: $33.75 on claude-opus-4-1-20250805, $11.25 on claude-opus-4-5-20251101 (−66.7%).

Other tiers, prompt-size bands and modalities are on each model's page.

Limits

Tokens

Limit	claude-opus-4-1-20250805	claude-opus-4-5-20251101	Change
Context window	Not published	200,000 tokensin place when tracking began (October 6, 2026) · source	—
Max output tokens	Not published	64,000 tokensin place when tracking began (October 6, 2026) · source	—

Benchmarks

Same benchmark and source on both sides; settings named where they differ

Benchmark	claude-opus-4-1-20250805	claude-opus-4-5-20251101	Change
Arena TextArena, high effort 32k (vs thinking 16k). Ranges don't overlap. Other settings 1448 ±3 → 1470 ±3	1450 ±3	1474 ±4	+24
Arena Text: CodingArena, high effort 32k (vs thinking 16k). Ranges don't overlap. Other settings 1505 ±5 → 1523 ±5	1511 ±6	1531 ±7	+20
Arena WebDevArena, high effort 32k (vs no setting). Ranges don't overlap. Other settings 1390 ±11 → 1469 ±7	1390 ±11	1493 ±8	+103
Arena SearchArena. Ranges don't overlap.	1167 ±5	1187 ±6	+20
FrontierMath Tier 4Epoch AI, 32k.	2.4%	4.9%	+2.5 pts
FrontierMath Tiers 1-3Epoch AI, 32k.	12.6%	34.4%	+21.8 pts
GPQA DiamondEpoch AI, 32k (vs 16k). Other settings 77.3% → 85.5% 16k 73.2% → 80.7%	77.3%	86.0%	+8.7 pts
OTIS Mock AIME 2024-2025Epoch AI, 32k (vs 27k). Other settings 64.4% → 81.7% 16k 40.0% → 48.1%	68.9%	86.1%	+17.2 pts
SWE-bench VerifiedEpoch AI.	73.3%	76.7%	+3.4 pts

A score from one source is never compared with another source's, and company-reported scores are compared only within the same company; settings named where they differ. Data: Arena (arena.ai), CC BY 4.0; Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.

Features and parameters

Compare models

No feature is published for both models, so none can be compared.

Not published for claude-opus-4-1-20250805: Structured outputs, Function calling, Prompt caching, Batch API, Image input, PDF input, Reasoning / thinking, Fine-tuning, Built-in web search, temperature parameter, top_p parameter, logprobs, Context window, Max output tokens.

Not published for claude-opus-4-5-20251101: Structured outputs, Function calling, PDF input, Fine-tuning, Built-in web search, temperature parameter, top_p parameter, logprobs.

Aliases

All aliases

No aliases point at claude-opus-4-1-20250805.

Aliases pointing at claude-opus-4-5-20251101: claude-opus-4-5 (in place when tracking began (October 6, 2026) · source)

On cloud platforms

All platform dates

Model	Platform	Platform ID	Shutdown	Time left
claude-opus-4-1-20250805	Amazon Bedrock	anthropic.claude-opus-4-1-20250805-v1:0	Jan 8, 2027Legacy	85 days
claude-opus-4-1-20250805	Microsoft Foundry	claude-opus-4-1	Aug 5, 2026Retired on August 5, 2026
claude-opus-4-5-20251101	Amazon Bedrock	anthropic.claude-opus-4-5-20251101-v1:0	not before Nov 24, 2026Active
claude-opus-4-5-20251101	Microsoft Foundryversion 1	claude-opus-4-5	Nov 24, 2026Active	40 days

Read daily from each platform's own pages. The status above uses each company's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.

Checklist

Change the model string from claude-opus-4-1-20250805 to claude-opus-4-5-20251101.

Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: claude-opus-4-1-20250805, claude-opus-4-5-20251101.