GPT-5.5 (Spud) vs Llama 5 vs Claude Opus 4.6: What We Know
GPT-5.5 (Spud) vs Llama 5 vs Claude Opus 4.6: What We Know
As of April 10, 2026, the AI frontier is in flux. Llama 5 launched two days ago. GPT-5.5 (Spud) is rumored for April 16. Claude Opus 4.6 still leads coding. Here’s the state of play.
Last verified: April 10, 2026
Release Status
| Model | Status | Released |
|---|---|---|
| Claude Opus 4.6 | ✅ Live | February 4, 2026 |
| GPT-5.4 | ✅ Live | March 5, 2026 |
| Llama 5 | ✅ Live | April 8, 2026 |
| GPT-5.5 (Spud) | 🔮 Imminent | Rumored April 16, 2026 |
What We Know About GPT-5.5 (Spud)
Confirmed:
- Pretraining finished March 24, 2026
- Codename: Spud
- Altman called it “a very strong model” that could “accelerate the economy”
- Designed as backbone of a unified OpenAI super-app
Rumored / Leaked:
- Release date: April 16, 2026 (unconfirmed)
- Benchmark target: Close gap on hard reasoning where GPT-5.4 trails competitors
- Polymarket odds: 78% release by April 30, 95%+ by June 30
Unknown:
- Parameter count
- Pricing
- Whether it launches as “GPT-5.5” or “GPT-6”
- Context window
- Whether it will ship with new agentic capabilities
Current Frontier Leaders (Pre-Spud)
| Benchmark | Leader |
|---|---|
| SWE-bench Verified | Claude Opus 4.6 (80.8%) |
| MMLU-Pro | Gemini 3.1 Pro (94.1%) |
| AIME 2025 | GPT-5.4 Thinking (93%) |
| Context length | Llama 5 (5M tokens) |
| Cost/performance | DeepSeek V4 |
| Autonomous coding | Claude Code + Claude Opus 4.6 |
What Spud Likely Targets
Based on OpenAI’s historical pattern and Altman’s language:
- Reasoning supremacy — Reclaim AIME / GPQA top spot from its own GPT-5.4 Thinking
- Coding leadership — Close the SWE-bench gap to Claude Opus 4.6
- Agentic benchmarks — Match or beat Llama 5’s native agentic capabilities
- Multimodal — Likely improvements over GPT-5.4’s already-strong multimodal
- Pricing aggression — Altman has hinted at cost cuts
Head-to-Head Predictions
These are speculative — final benchmarks won’t land until launch.
| Benchmark | GPT-5.5 (est.) | Llama 5 | Claude Opus 4.6 |
|---|---|---|---|
| MMLU-Pro | ~89-92% | ~87% | ~86% |
| SWE-bench Verified | ~78-82%? | ~74% | 80.8% |
| AIME 2025 | ~94-96%? | ~88% | ~87% |
| GPQA Diamond | ~88-91%? | ~84% | ~85% |
If Spud lands at the upper end of these ranges, it reclaims reasoning and ties or beats Claude on coding. If it lands at the lower end, it’s a modest upgrade over GPT-5.4 and Claude Opus 4.6 retains the coding crown.
What Happens to the Others at Launch
Claude Opus 4.6: Likely retains coding leadership unless Spud beats 80.8% on SWE-bench convincingly. Anthropic’s Claude Sonnet/Opus 5 cycle is reportedly targeting Q2 2026.
Llama 5: Retains open-weight crown and longest context (5M). Meta doesn’t need to beat GPT-5.5 — Llama 5’s value is being “good enough at frontier level, open weights.”
Gemini 3.1 Pro: Google will almost certainly respond within weeks with a Gemini 3.5 Pro or Gemini 4 tease. Expect a response announcement at Google I/O 2026.
DeepSeek V4: Untouchable on cost. Any frontier improvements from Spud will push DeepSeek to accelerate V5.
Strategic Advice
If you can wait 2-4 weeks:
- Delay major model commitments
- Expect price cuts across the board after Spud lands
- Watch for Google and Anthropic responses in May
If you need to ship now:
- Coding: Claude Opus 4.6 (via Claude Code)
- Reasoning: GPT-5.4 Thinking
- Long context: Llama 5
- Cost: DeepSeek V4
- Privacy: Llama 5 self-hosted
The April 2026 Reality
This is the most competitive frontier in AI history. In one month, the industry added Llama 5 (open-weight frontier), and will likely add GPT-5.5 (Spud). Claude Opus 4.6’s coding lead is the most stable moat, but everything else is moving weekly.
Bookmark this page — we’ll update the moment Spud launches.
Last verified: April 10, 2026