Alex Getmanearly AI signals
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Claude Sonnet 5

Anthropic

Released Updated
Context window
1M
1,000,000 tokens
Max output
128K
128,000 tokens
Input / Output
text, image → text

API pricing

USD / 1M tokens

InputOutputCached input
  • $2.00
anthropic-pricing
  • $10.00
anthropic-pricing
  • $0.20
anthropic-pricing
Calculate your workload
Input / output price · USD / 1M tokens
ModelEvidence linksInput / output price
claude-sonnet-5
batch
anthropic
API route unavailable
$1.00 / $5.00
claude-sonnet-5
standard
anthropic$2.00 / $10.00

Timeline

Related signals: Claude Sonnet 5.5

evidence link

  1. · Evidence links · Anthropic · official articles
  2. · Confirmed use · Anthropic · customer stories · Rocket Money on building agents that fix their own code
    Excerpt
    We use Sonnet 5 for most subagents, and for a financial task that needs real reasoning we reach for Opus
  3. · Evidence links · Claude Code · changelog
  4. · Evidence links · Claude Code · changelog
    Excerpt
    Claude Sonnet 5 sessions no longer use the mid-conversation system role for harness reminders
  5. · Evidence links · Anthropic · SDK releases
  6. · Alex's posts · Alex Getman
    Excerpt
    🚨 Sonnet 5.5 benchmarks are out It crushes Sonnet 5, goes toe-to-toe with Opus 5.5, and beats GPT-6 Sol across most shared benchmarks.
  7. · Alex's posts · model family · Alex Getman
    Excerpt
    Claude Sonnet 5.5 is already rolling out in stealth. A lot of users, including free users, are being routed to it. The release is very close.
  8. · Alex's posts · Alex Getman
    Excerpt
    ⚡️ Google just dropped Gemini 3.7 Flash It’s a big upgrade over 3.6 Flash for coding and agents. Google also cut the price in half to $0.75 per 1M input tokens and $3.75 per 1M output. Benchmarks put it very close to Claude Sonnet 5, while costing almost 3x less.
  9. · Alex's posts · Alex Getman
    Excerpt
    ⚡️ RELEASE: KIMI K3 Moonshot just dropped its new flagship: 2.8T parameters, a 1M-token context window, native vision, and a focus on large projects, coding, games, and 3D. Full weights are expected in the next few days. API: $3 / $15 per million input/output tokens. Pricing-wise, that puts it around Sonnet 5 or GPT-5.6 Terra, while Moonshot’s own benchmarks have it taking shots at Opus 4.8 and Sol. So basically: Opus-class performance at Sonnet pricing. You can already try it for free on the Kimi website or through Kimi Code CLI.
  10. · Alex's posts · Alex Getman
    Excerpt
    Sonnet 5 looks absurdly priced • Opus 4.8 Max - $1.80 • Sonnet 5 Max - $2.29 • Fable 5 - $2.75 Sonnet 5 is about 27% more expensive than Opus 4.8. Why does the lower-tier model cost more than the flagship?

Alex's take

Signals 2

AnthropicSighting

gpt-5.5-high

Confirmed13 evidence links
Specifications

Claude Sonnet 5 is a model from Anthropic, released on 30 Jun 2026. The context window is 1,000,000 tokens. The maximum output is 128,000 tokens. Pricing is $2.00 per million input tokens and $10.00 per million output tokens.

Context window
1,000,000
Max output
128,000
Input
text · image
Output
text
Input · USD / 1M tokens
$2.00
Output · USD / 1M tokens
$10.00
Cached input · USD / 1M tokens
$0.20

Questions

What is the context window of Claude Sonnet 5?

The context window is 1,000,000 tokens. The maximum output is 128,000 tokens.

How much does Claude Sonnet 5 cost?

Pricing is $2.00 per million input tokens and $10.00 per million output tokens. Cached input is $0.20 per million.

When was Claude Sonnet 5 released?

On 30 Jun 2026.