Model vs model
Claude Opus 5.5 vs DeepSeek V4 Pro
Claude Opus 5.5 and DeepSeek V4 Pro are both in llmwise. What each gets on every plan, what it reads, how it's served and what happens when its provider fails, from the catalog and the code that runs them.
Model prices and specs checked against OpenRouter's Claude Opus 5.5 page, OpenRouter's DeepSeek V4 Pro page.
Short answer
DeepSeek V4 Pro gets four times as many messages: up to 250 messages a month on Pro, against up to 62 messages a month for Claude Opus 5.5. Otherwise, only Claude Opus 5.5 reads images, only Claude Opus 5.5 reads a PDF as the whole file, only Claude Opus 5.5 can be passed to another model by its maker's safety system, and only DeepSeek V4 Pro is in the free trial.
Claude Opus 5.5 and DeepSeek V4 Pro on every plan
Whether the one-time free trial reaches each model, then each paid plan's messages on it.
| Plan | Price | Claude Opus 5.5 | DeepSeek V4 Pro |
|---|---|---|---|
| Free | $0 | Not in the trial | In the one-time trial of 5 messages |
| Pro | $20 a month | Up to 62 a month | Up to 250 a month |
| Max | $50 a month | Up to 200 a month | Up to 800 a month |
| Ultra | $100 a month | Up to 450 a month | Up to 1,800 a month |
| Studio | $200 a month | Up to 1,000 a month | Up to 4,000 a month |
Prices don't include tax, which is added where it applies and shown before you pay. A paid plan's month is one allowance shared by every model, so each monthly count is the most you get if all of it goes to that model. It renews each billing period; everyday models refill daily at 00:00 UTC. Long chats count more per reply. How pricing works.
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
What differs
Messages on Pro
DeepSeek V4 Pro gets four times as many messages: up to 250 messages a month on Pro, against up to 62 messages a month for Claude Opus 5.5.
Context window
Claude Opus 5.5 takes up to 1M tokens; DeepSeek V4 Pro up to 1.05M tokens. A chat in llmwise holds up to 200k tokens, which fits in either, so the difference shows only through each maker's own API.
Images and PDFs
DeepSeek V4 Pro doesn't read images. DeepSeek V4 Pro gets a PDF's text rather than the file itself.
On Free
DeepSeek V4 Pro is in the free trial; Claude Opus 5.5 needs a paid plan.
Where messages go
Claude Opus 5.5: Sent to Anthropic directly. DeepSeek V4 Pro: Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked.
Fact by fact
| Fact | Claude Opus 5.5 | DeepSeek V4 Pro |
|---|---|---|
| Context window | 1M tokens | 1.05M tokens |
| Reads images | Yes | No |
| PDFs | Whole file | Text only |
| Reasoning | Yes | Yes |
| API price (September 2026) | $4.00 in / $20.00 out per million tokens | $0.44 in / $2.90 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0300 | $0.0038 |
| A $10 top-up adds | 50 messages | 200 messages |
| Where a message goes | Sent to Anthropic directly. | Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked. |
| If the provider fails | If Anthropic fails before the reply starts (an overload, a server error, a dropped connection), llmwise sends the same request to Claude Opus 5.5 through OpenRouter instead. | When one host is down, OpenRouter moves the request to another host that meets the same rules. |
| Anthropic's safety fallback | Anthropic's safety system can pass a Claude Opus 5.5 message to another Claude model. The reply then names the model that answered and says what you were charged for. | Doesn't apply |
Claude Opus 5.5 or DeepSeek V4 Pro?
From the facts above, not from benchmarks: the rest is how their answers suit your work, which one chat can show you.
Pick Claude Opus 5.5: it reads images; it reads a PDF as the whole file, charts and scans included.
Pick DeepSeek V4 Pro: more messages for the money, up to 250 messages a month on Pro; you can try it in the free trial.
Try Claude Opus 5.5 and DeepSeek V4 Pro on your own question
Start a chat on Claude Opus 5.5 and ask a real question from your work, with any files it needs.
Switch the model picker to DeepSeek V4 Pro and ask for its answer to the same question. It sees the whole chat, including Claude Opus 5.5's answer.
Compare the two on what matters to you: accuracy, tone, length, how much you'd have to fix. If it's close, ask each a follow-up.
The badge by each model in the picker shows what a message uses before you send it.
Each model's page, the families, and other pairs
Claude Opus 5.5 vs DeepSeek V4 Pro is one pair of models. The page below covers the whole families.
- Claude Opus 5.5: price, limits and messages on every plan
- DeepSeek V4 Pro: price, limits and messages on every plan
- DeepSeek vs Claude
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Opus 5.5 vs Claude Sonnet 5
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Sol
- Every model-vs-model page
Claude Opus 5.5 is a Claude model; DeepSeek V4 Pro is a DeepSeek model.
Questions
Is Claude Opus 5.5 or DeepSeek V4 Pro cheaper in llmwise?
DeepSeek V4 Pro gets four times as many messages: up to 250 messages a month on Pro, against up to 62 messages a month for Claude Opus 5.5. Every paid plan's monthly allowance is shared by all models, so each count is the most you get if it all goes to that model.
Can I try Claude Opus 5.5 and DeepSeek V4 Pro for free?
DeepSeek V4 Pro is, in the free trial of 5 messages; Claude Opus 5.5 needs a paid plan.
Which has the bigger context window, Claude Opus 5.5 or DeepSeek V4 Pro?
DeepSeek V4 Pro: 1.05M tokens, against 1M tokens. A chat in llmwise holds up to 200k tokens, which fits in either, so the difference shows only through each maker's own API.
Can I use Claude Opus 5.5 and DeepSeek V4 Pro in the same chat?
Yes. Pick Claude Opus 5.5 for one message and DeepSeek V4 Pro for the next; the second sees the whole chat, including the first one's answer.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.