Migrating from claude-sonnet-4-5-20250929 to claude-sonnet-4-6

What changes when you move from claude-sonnet-4-5-20250929 to claude-sonnet-4-6: input price 0%, output price 0%, context window 200,000 → 1,000,000 tokens.

From: claude-sonnet-4-5-20250929
Status: Deprecated
Shutdown: Nov 30, 2026
Time left: 46 days

To: claude-sonnet-4-6
Status: Active
Shutdown: not before Feb 17, 2027
Time left: —

Prices

USD per 1M tokens, standard tier

Type	claude-sonnet-4-5-20250929	claude-sonnet-4-6	Change
Input	$3.00first seen October 1, 2026 · source	$3.00first seen October 1, 2026 · source	0%
Cached input	$0.30first seen October 1, 2026 · source	$0.30first seen October 1, 2026 · source	0%
Output	$15.00first seen October 1, 2026 · source	$15.00first seen October 1, 2026 · source	0%

At 1M input and 250K output tokens a month: $6.75 on claude-sonnet-4-5-20250929, $6.75 on claude-sonnet-4-6 (0%).

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

Limits

Tokens

Limit	claude-sonnet-4-5-20250929	claude-sonnet-4-6	Change
Context window	200,000 tokensin place when tracking began (October 6, 2026) · source	1,000,000 tokensin place when tracking began (October 6, 2026) · source	+400%
Max output tokens	64,000 tokensin place when tracking began (October 6, 2026) · source	128,000 tokensin place when tracking began (October 6, 2026) · source	+100%

Benchmarks

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

Benchmark	claude-sonnet-4-5-20250929	claude-sonnet-4-6	Change
Arena TextArena. Ranges don't overlap.	1455 ±3	1472 ±4	+17
Arena Text: CodingArena. Ranges don't overlap.	1512 ±5	1528 ±6	+16
Arena WebDevArena. Ranges don't overlap.	1385 ±7	1522 ±5	+137
Arena SearchArena. Ranges don't overlap.	1176 ±5	1202 ±5	+26
Arena DocumentArena. Ranges don't overlap.	1449 ±6	1478 ±6	+29
GPQA DiamondEpoch AI, 32k. Other settings not run → 83.3% high effort not run → 83.3% medium effort not run → 78.8% max effort	81.7%	87.4%	+5.7 pts
OTIS Mock AIME 2024-2025Epoch AI, 32k. Other settings not run → 82.2% medium effort not run → 75.6% high effort not run → 71.1% max effort	77.8%	85.8%	+8.0 pts
SimpleQA VerifiedEpoch AI, high effort (vs 59k). Other settings not run → 32.8% max effort	30.7%	35.5%	+4.8 pts
SWE-bench VerifiedEpoch AI.	71.3%	75.2%	+3.9 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

Same on both

Prompt caching: supported on both.claude-sonnet-4-5-20250929: in place when tracking began (October 6, 2026) · source · claude-sonnet-4-6: in place when tracking began (October 6, 2026) · source
Batch API: supported on both.claude-sonnet-4-5-20250929: in place when tracking began (October 6, 2026) · source · claude-sonnet-4-6: in place when tracking began (October 6, 2026) · source
Image input: supported on both.claude-sonnet-4-5-20250929: in place when tracking began (October 6, 2026) · source · claude-sonnet-4-6: in place when tracking began (October 6, 2026) · source
Reasoning / thinking: supported (thinking: extended; effort: not supported) on claude-sonnet-4-5-20250929, supported (thinking: adaptive, extended deprecated; default effort: high) on claude-sonnet-4-6.claude-sonnet-4-5-20250929: in place when tracking began (October 6, 2026) · source · claude-sonnet-4-6: in place when tracking began (October 6, 2026) · source

Not published for claude-sonnet-4-5-20250929: Structured outputs, Function calling, PDF input, Fine-tuning, Built-in web search, temperature parameter, top_p parameter, logprobs.

Not published for claude-sonnet-4-6: Structured outputs, Function calling, PDF input, Fine-tuning, Built-in web search, temperature parameter, top_p parameter, logprobs.

Aliases

All aliases

Aliases pointing at claude-sonnet-4-5-20250929: claude-sonnet-4-5 (in place when tracking began (October 6, 2026) · source)

No aliases point at claude-sonnet-4-6.

On cloud platforms

All platform dates

Model	Platform	Platform ID	Shutdown	Time left
claude-sonnet-4-5-20250929	Amazon Bedrock	anthropic.claude-sonnet-4-5-20250929-v1:0	Apr 8, 2027Legacy	175 days
claude-sonnet-4-5-20250929	Microsoft Foundryversion 1	claude-sonnet-4-5	Nov 30, 2026Active	46 days
claude-sonnet-4-6	Amazon Bedrock	anthropic.claude-sonnet-4-6	not before Feb 17, 2027Active
claude-sonnet-4-6	Microsoft Foundryversion 1	claude-sonnet-4-6	Feb 10, 2027Active	118 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-sonnet-4-5-20250929 to claude-sonnet-4-6.

Time until shutdown

45days

11hours

03min

52sec

Counting to 7:00 pm ET on November 29, 2026, which is 00:00 UTC on November 30, 2026.

Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: claude-sonnet-4-5-20250929, claude-sonnet-4-6.