Claude Opus 5.5 Paid vs 
GPT-6.1 Sol Pro Paid
Claude Opus 5.5 vs GPT-6.1 Sol Pro compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Claude Opus 5.5 — full profile › · GPT-6.1 Sol Pro — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$20 /M outputManaged API (no infra to run)
$10 /M outputManaged API (no infra to run)
Claude Opus 5.5 vs GPT-6.1 Sol Pro specs
| Spec | Claude Opus 5.5 | GPT-6.1 Sol Pro | Winner |
|---|---|---|---|
| Maker | Anthropic | OpenAI | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1M tokens | 1.1M tokens | |
| Input price | $4/M | $2/M | |
| Output price | $20/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
GPT-6.1 Sol Pro is ~2.0× cheaper than Claude Opus 5.5 on output tokens ($10 vs $20 per M tokens).
- You want frontier performance through a managed API
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You need the longer 1.1M context window
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Claude Opus 5.5 | GPT-6.1 Sol Pro |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: Claude Opus 5.5 vs GPT-6.1 Sol Pro
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Claude Opus 5.5 and GPT-6.1 Sol Pro score
| Criterion | Claude Opus 5.5 | GPT-6.1 Sol Pro |
|---|---|---|
| Cost-efficiency | 3.0 | 3.5 |
| Context window | 5.0 | 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
Claude Opus 5.5 Paid
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
GPT-6.1 Sol Pro Paid
GPT-6.1 Sol Pro is the same underlying model as [GPT-6.1 Sol](https://openrouter.ai/openai/gpt-6.1-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Claude Opus 5.5 vs GPT-6.1 Sol Pro — which is cheaper?
GPT-6.1 Sol Pro is cheaper on output ($10/M vs $20/M).
Which has the larger context window?
GPT-6.1 Sol Pro offers the larger context window (1.1M tokens).
Claude Opus 5.5 vs GPT-6.1 Sol Pro — which should I pick in 2026?
Choose GPT-6.1 Sol Pro for the lower output price ($10/M vs $20/M). It also gives you the larger 1.1M context window.
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