o3 Paid vs 
Claude Sonnet 5 Paid
o3 vs Claude Sonnet 5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
o3 — full profile › · Claude Sonnet 5 — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$8 /M outputManaged API (no infra to run)
$10 /M outputManaged API (no infra to run)
o3 vs Claude Sonnet 5 specs
| Spec | o3 | Claude Sonnet 5 | Winner |
|---|---|---|---|
| Maker | OpenAI | Anthropic | – |
| Type | Proprietary | Proprietary | – |
| Context window | 200K tokens | 1M tokens | |
| Input price | $2/M | $2/M | = Tie |
| Output price | $8/M | $10/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You need the longer 1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | o3 | Claude Sonnet 5 |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✗ | ✓ |
Benchmarks: o3 vs Claude Sonnet 5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How o3 and Claude Sonnet 5 score
| Criterion | o3 | Claude Sonnet 5 |
|---|---|---|
| Cost-efficiency | 3.5 | 3.5 |
| Context window | 4.0 | 5.0 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
o3 Paid
o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following....
Claude Sonnet 5 Paid
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
o3 vs Claude Sonnet 5 — which is cheaper?
o3 is cheaper on output ($8/M vs $10/M).
Which has the larger context window?
Claude Sonnet 5 offers the larger context window (1M tokens).
o3 vs Claude Sonnet 5 — which should I pick in 2026?
Choose o3 for the lower output price ($8/M vs $10/M). Choose Claude Sonnet 5 if you need the larger 1M context window.
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