Claude Sonnet 4.5
- Family
- Claude 4.5
- Released
- 2025-09-29
- Context
- 200k
- Architecture
- Decoder Only
- Knowledge cutoff
- 2025-12
- Specialization
- general
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
- Training
- Fine-tuned
Cheapest of 8 routes · Anthropic
About
Claude Sonnet 4.5 is Anthropic's Claude 4.5 model with multimodal text and image input and an optional reasoning mode. It offers a 200K-token context window and scores 86 on MMLU PRO.
Provider price ladder
Compare all 8Compare API pricing across 4 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Batch in / out | Cache | Route |
|---|---|---|---|---|---|
| Anthropic | $3.00 | $15.00 | $1.50 / $7.50 | - | Serverless |
| GCP Vertex AI | $3.00 | $15.00 | - | - | Serverless |
| Microsoft Foundry | $3.00 | $15.00 | - | read $0.300 / 5m $3.75 / 1h $6.00 | ServerlessProvisioned |
| OpenRouter | $3.00 | $15.00 | - | - | Serverless |
Available via routers & gateways(16)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.
AIRouter
RouterCommercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.
Amazon Bedrock Intelligent Prompt Routing
RouterAWS Bedrock's native intelligent prompt router that routes prompts between Anthropic Claude model tiers (Haiku/Sonnet) based on predicted task complexity, with no extra per-routing charge.
Azure AI Foundry Model Router
RouterMicrosoft Azure AI Foundry's native model router that uses a trained ML model to route each prompt in real time to the optimal Azure-hosted model, with Balanced/Cost/Quality mode selection and automatic failover.
Capabilities
Benchmark peer barsfor Coding
Benchmark scores(6)
| Benchmark | Score | Version | Evaluation | Source |
|---|---|---|---|---|
| Massive Multi-discipline Multimodal Understanding | 77.8 | —Observed 2026-04-15 | — | Source |
| BFCL | 73.2 | —Observed 2026-04-14 | — | Source |
| MMLU PRO | 86.0 | —Observed 2026-04-14 | — | Source |
| MMMU Pro | 68.9 | official Anthropic (comparison model in Opus 4.6 system card), with image cropping toolObserved 2026-02-01 | — | Source |
| SWE-bench Verified | 77.2 | —Observed 2025-09-29 | — | Source |
| Google-Proof Q&A | 83.4 | —Observed 2025-09-29 | — | Source |
Migration checks
No linked migration route is available for this model yet.
Rankings & picks(2)
Compare Claude Sonnet 4.5 with other models
Comparison and alternatives
Browse all comparisons →Show all 65 popular comparisonssorted by 7-day search impressions
Cheapest of 8 routes · Anthropic