Claude Mythos 5 vs Ornith 1.0 31B vs GPT-5.6 Cyber
Claude Mythos 5 comes out ahead, 66 to 60 and 51 on our weighted score, and it is the cheaper option too.
- Our pick
AnthropicClaude Mythos 5
66/100- ECI—
- Price$10.00 / $50.00
- Context1M
DeepReinforce
Ornith 1.0 31B
51/100- ECI—
- Price—
- Context262K
OpenAIGPT-5.6 Cyber
60/100- ECI—
- Price$12.50 / $75.00
- Context400K
Claude Mythos 5 is our pick
Claude Mythos 5 is the better all-round choice, scoring 66/100 against GPT-5.6 Cyber (60) and Ornith 1.0 31B (51). It leads on context window. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceClaude Mythos 5Claude Mythos 5 $20.00 · GPT-5.6 Cyber $28.13 per 1M tokens (3:1 blend) · Ornith 1.0 31B unpriced
- Longest contextClaude Mythos 5Claude Mythos 5 1,000,000 · GPT-5.6 Cyber 400,000 · Ornith 1.0 31B 262,144 tokens
- Widest inputsClaude Mythos 5Claude Mythos 5: Text, Images, PDFs · Ornith 1.0 31B: Text, Images · GPT-5.6 Cyber: Text, Images
- Self-hostingOrnith 1.0 31BPublishes downloadable weights (MIT)
| Measure | Weight | Claude Mythos 5 | Ornith 1.0 31B | GPT-5.6 Cyber |
|---|---|---|---|---|
| Inputs & features | 60% | 70 | 60 | 70 |
| Context window | 40% | 60 | 37 | 44 |
| Overall | 100% | 66/100 | 51/100 | 60/100 |
Left out because at least one model lacks the data: capability and price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Claude Mythos 5Anthropic | Ornith 1.0 31BDeepReinforce | GPT-5.6 CyberOpenAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $10.00 (best) | — | $12.50 |
| Output | $50.00 (best) | — | $75.00 |
| Cached input | — | — | $1.25 |
| Blended (3:1) | $20.00 (best) | — | $28.13 |
| Long-context rate | Same rate | — | Same rate |
| Price source | Median of 2 providers | — | Official OpenAI API |
| Limits | |||
| Context window | 1,000,000 tokens (best) | 262,144 tokens | 400,000 tokens |
| Max output | 128,000 tokens | — | 128,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yes | Yes | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | No | Yes |
| Availability | |||
| Weights | Proprietary | OpenMIT | Proprietary |
| API model ID | — | — | gpt-daybreak-red-latest |
| API providers | 2 (best) | — | 1 |
| Released | Jun 9, 2026 | Jun 25, 2026 | Aug 7, 2026 |
| Knowledge cutoff | Jan 31, 2026 | — | Feb 16, 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Mythos 5$200.00
- Ornith 1.0 31B—
- GPT-5.6 Cyber$275.00
Which should you choose?
Which is better: Claude Mythos 5, Ornith 1.0 31B or GPT-5.6 Cyber?
Claude Mythos 5 is the better all-round choice, scoring 66/100 against GPT-5.6 Cyber (60) and Ornith 1.0 31B (51). It leads on context window. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Claude Mythos 5, Ornith 1.0 31B or GPT-5.6 Cyber?
Claude Mythos 5 is cheaper at $10.00 input / $50.00 output per million tokens (median across 2 API providers). GPT-5.6 Cyber costs $12.50 input / $75.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $20.00 per million tokens for Claude Mythos 5 versus $28.13 for GPT-5.6 Cyber (1.4× as much). Ornith 1.0 31B has no published per-token price.
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Claude Mythos 5 has not been scored yet, Ornith 1.0 31B has not been scored yet and GPT-5.6 Cyber has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Mythos 5, Ornith 1.0 31B and GPT-5.6 Cyber yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
Claude Mythos 5 has the largest context window at 1,000,000 tokens, against 400,000 for GPT-5.6 Cyber and 262,144 for Ornith 1.0 31B. Maximum output per response: Claude Mythos 5 up to 128,000, GPT-5.6 Cyber up to 128,000 tokens.
Which can read images, PDFs, audio or video?
Claude Mythos 5 accepts text, images and PDFs; Ornith 1.0 31B accepts text and images; GPT-5.6 Cyber accepts text and images. Claude Mythos 5 handles the widest range of inputs.
Are any of these open source?
Ornith 1.0 31B publishes its weights (MIT) and can be self-hosted; Claude Mythos 5 and GPT-5.6 Cyber is proprietary.
Which is newer?
GPT-5.6 Cyber is the newest, released Aug 7, 2026. Ornith 1.0 31B came out Jun 25, 2026; Claude Mythos 5 came out Jun 9, 2026. Knowledge cutoff: Claude Mythos 5 Jan 31, 2026, GPT-5.6 Cyber Feb 16, 2026.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
