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Anthropic: Claude Sonnet 4.5 (20250929)
anthropic·anthropic/claude-sonnet-4-5-20250929-5·GA·Closed·claude-sonnet series
Balanced Claude model for coding, analysis, agent workflows, and cost control
At a glance
Reference price$3.00 / $15.00 per 1M
Cache read $0.30 · Helicone
Lowest paid$3.00 / $15.00
Helicone Gateway
Context200,000
Output limit64,000
Capabilities
✓ Reasoning✓ Tool use? Structured output✓ TemperatureAttachments
Modalities
TextImage
Knowledge cutoff2025-09
Released / updated2025-09-29 / 2025-09-29
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 1 providers1 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Helicone claude-sonnet-4-5-20250929 | Gateway | $3.00 | $15.00 | $0.30 | $3.75 | 200,000 | 64,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1Helicone$1,026.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
Toggle (on / off)budget_tokens ≥ 1,024 ≤ 63,999
Related models
Claude Sonnet 5same series$2.00 / $10.00Claude Sonnet 5 Thinkingsame series$2.00 / $10.00Claude Sonnet 5 (JP)same series$2.00 / $10.00GLM-5.2cheaper alternative$1.40 / $4.40GPT OSS 120Bcheaper alternative$1.00 / $4.20Kimi K2.6cheaper alternative$0.95 / $4.00DeepSeek V4 Procheaper alternative$0.435 / $0.87
Price historyone sample accumulated per data sync
Input list $3.00Output list $15.00Min blended $6.00
Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-21). Each future sync adds a point, and once accumulated a line is drawn here.