AI Chat Assistant
GPT, Claude, Gemini and DeepSeek in one chat. Pay per token, no subscription.
Opens chat.problembo.app
About the service
AI chat with GPT, Claude, Gemini and DeepSeek in one place
ProblemboChat is an AI chat where you switch between GPT, Claude, Gemini, DeepSeek and GLM models in one window with one conversation history. There is no subscription: you pay per token for each answer. You need a Problembo account, and DeepSeek V4 Flash can be paid for with the free daily bonus.
How to start
- Open chat.problembo.com and sign in with your Problembo account — the same one you use on the main site, with the same balance.
- Pick a model from the list above the message box. You can switch at any time, even mid-chat.
- Type your question, attach an image or dictate it.
- The cost of the answer is deducted from your balance once the model finishes writing.
Which model to choose
Prices are in USD per 1M tokens (input / output) as of October 15, 2026. One million tokens is roughly 750,000 English words. GPT models cost more than listed when a prompt exceeds 272,000 tokens.
| Model | Input / output | Images | Web search | Daily bonus |
|---|---|---|---|---|
| DeepSeek V4 Flash | $0.078 / $0.234 | via a caption | no | yes |
| GPT-5.6 Luna | $0.13 / $0.78 | yes | yes | no |
| Gemini 3.8 Flash | $0.49 / $2.44 | yes | yes | no |
| Gemini 3.1 Pro | $0.65 / $4.55 | yes | yes | no |
| GLM-5.2 | $0.73 / $2.34 | via a caption | no | no |
| GPT-6.1 Sol | $1.30 / $6.50 | yes | yes | no |
| GPT-5.6 Terra | $1.30 / $7.80 | yes | yes | no |
| DeepSeek V4 Pro | $1.69 / $3.38 | via a caption | no | no |
| Claude Sonnet 5 | $2.60 / $13.00 | yes | yes | no |
| Claude Opus 5.5 | $2.60 / $13.00 | yes | yes | no |
| GPT-5.6 Sol | $3.25 / $19.50 | yes | yes | no |
| Claude Fable 5 | $5.20 / $26.00 | no | no | no |
| GPT-6 Astra | $6.50 / $32.50 | yes | yes | no |
"Via a caption" means the model does not see the image itself: another model describes it first, and DeepSeek or GLM answers from that description. Current prices for every model are in the price table in the chat's account menu.
If a model's primary provider is unavailable, a backup provider may serve the request, and the answer can then cost more than the table shows.
What the chat can do
- Long context. Models accept up to 1M tokens, so you can paste a long document or keep one conversation going for a long time. Each new answer costs more as the history grows, because the model rereads the whole conversation.
- Images. Attach a screenshot, a photo of a document or a chart and ask about it.
- Web search. GPT, Gemini, Claude Opus 5.5 and Claude Sonnet 5 can look up fresh information online.
- Agents. Save instructions for a recurring task, such as translation or proofreading, and reuse them without pasting the prompt again.
- Voice input. Uses your browser's speech recognition where the browser supports it.
For images, video and voice-overs, use the dedicated tools that show the price before each run: AI image generator, AI video generator and text to speech.
Free to try, no subscription
You pay only for tokens, with no monthly plan. DeepSeek V4 Flash can be paid for with the bonus balance, which can be restored up to $0.60 once per UTC day — at its price that covers hundreds of typical messages a day. Recent paying users receive the bonus automatically; everyone else claims it on the Daily bonus page. All other models require a topped-up balance. Details: pricing and bonus terms.
Frequently asked questions
Can I use the AI chat for free? Yes, with DeepSeek V4 Flash within the daily bonus. Other models need a topped-up balance.
Do I need to sign up? Yes. The chat works only after you sign in to Problembo, since answers are billed to your account.
How much does one message cost? It depends on the model and the length of the conversation. A question and an answer of about 1,000 tokens each cost about $0.0003 on DeepSeek V4 Flash and about $0.008 on GPT-6.1 Sol. In a long conversation each new message costs more, because the model reads the whole history.
Is this the official ChatGPT? No. ProblemboChat is a separate service that connects to OpenAI, Anthropic, Google, DeepSeek and Z.AI models through their APIs. A ChatGPT Plus or Claude Pro subscription is not needed and does not apply here.
Can I switch models mid-conversation? Yes. Pick another model from the list, and it writes the next answer with the earlier messages in context.
Why did an answer cost more than I expected? Usually because of a long history: every answer pays for rereading the conversation. Start a new chat when the topic changes.
What's new
- GPT models now cost half as much.
- DeepSeek-V4-Flash can now be paid for using your bonus balance.
A new image generation and editing model is now available in our chat — Nano Banana 2 (powered under the hood by Google's Gemini 3.1 Flash Image).
What's new and why it's cool:
- Significantly cheaper: Generation has become much more affordable compared to the previous version. This is the case where quality goes up and the price goes down — an economy we like.
- High speed: The model delivers a finished result in an average of 10–15 seconds without losing quality. Time is money, and fast neural bananas are a double win.
- Perfect text: Excellent at generating typography and readable text in different languages directly on images. Ideal for mockups and presentations.
- Frame stability: Confidently maintains facial consistency (up to 5 characters) and preserves the details of complex scenes (up to 14 objects).
- Advanced logic: The model better understands complex multi-layered prompts and can rely on up-to-date data from the web.
Jump into the chat and test the new feature. It's a great tool for tasks that require a strict balance between speed, production quality, and a nice price.
We are expanding our visual content capabilities and adding support for the Google Nano Banana Pro model.
New features are now available to you directly in the chat interface:
- Image generation: create graphics from scratch using text descriptions.
- In-dialog editing: make changes and refine images directly while chatting with the model.
This update allows you to work with images faster and more conveniently without leaving the familiar chat window.
- Added the latest, most powerful models
- Added a pricing table
- Improved stability
- Reduced prices for all models (about 20%)
- Free models: gpt-5-mini and deepseek
Our chat now features GPT-5 - OpenAI's next-generation flagship artificial intelligence model! Released on August 7, 2025, this model represents a quantum leap in AI technology development 🎉
Key Features 🎯
GPT-5 impresses with its technical specifications:
- Unified Architecture 🏗️ - combines advanced reasoning, multimodal input, and task execution into a single system
- Enhanced Multimodality 🖼️ - supports text, images, audio, and potentially video with an input limit of 272,000 tokens
- Improved Memory 🧠 - effectively retains information across sessions for continuous project work
- MoE Architecture ⚡ - dynamic allocation of computational resources for specialized tasks
- Autonomous Tools 🤖 - performs actions without constant user input
Performance and Achievements 📊
The model demonstrates outstanding results:
- 94.6% on AIME 2025 🧮 - new record in mathematical problems
- 74.9% on SWE-bench Verified 💻 - excellence in real-world coding
- 88% on Aider Polyglot 🌐 - multilingual programming
- 80% reduction in hallucinations ✅ - compared to previous models
- 45% fewer factual errors 📚 - than GPT-4o when working with web search
Available Models 🎭
GPT-5 is available in two variants:
- Regular - full-featured version
- Mini - optimized for speed
Each model can operate at four reasoning levels: minimal, low, medium, and high.
Availability 🌟
GPT-5 is already integrated into our chat and ready to help you with:
- Complex multi-step workflows 🔄
- Writing and editing texts 📝
- Programming and code debugging 🛠️
- Visual analysis and understanding 👁️
- Scientific and academic research 🔬
- Creative projects and idea generation 💡
Try the power of GPT-5 right now in our chat! 🚀
We are excited to announce the addition of Grok-4 - the latest flagship AI model from xAI to our chat. This revolutionary model, released in July 2025, represents a significant breakthrough in the field of artificial intelligence.
Key Features
Grok-4 boasts impressive technical specifications:
- Extended context window - support for over 130,000 tokens for working with large documents and complex tasks
- Multimodal capabilities - analysis of text, images, and real-time visual content understanding
- Built-in programming support - specialized capabilities for development and code debugging
- Real-time search integration - access to up-to-date information from the internet
- Advanced tool usage - trained to independently select and apply various tools for problem-solving
Performance and Achievements
The model demonstrates outstanding results:
- Superiority over PhD level in all academic disciplines without exception
- 44.4% on Humanity's Last Exam - significant superiority over competitors
- 15.9% on ARC-AGI V2 - nearly double improvement compared to previous models
Availability
Grok-4 is already integrated into our chat and ready to help you with:
- Complex analysis and research
- Programming and development
- Creative tasks
- Working with images and multimedia
- Solving academic and professional questions